Ответы
Ответ дал:
0
а) вынесем 12 за скобку: 12(5+9) 14
---------- = ---
12•21 21
Б) 14(5-2) 3
--------- = --
14•2 2
Г) 81(17-15) 2
------------- = --
81(17+4) 21
Д) 2,4•6,3•2•3,5 1
--------------------- = --
6,3•2,4•2•3,5•9 9
---------- = ---
12•21 21
Б) 14(5-2) 3
--------- = --
14•2 2
Г) 81(17-15) 2
------------- = --
81(17+4) 21
Д) 2,4•6,3•2•3,5 1
--------------------- = --
6,3•2,4•2•3,5•9 9
Ответ дал:
0
а)
![frac{12*5+12*9}{12*21}=frac{12(5+9)}{12*21}=frac{14}{21}=frac{2}{3} frac{12*5+12*9}{12*21}=frac{12(5+9)}{12*21}=frac{14}{21}=frac{2}{3}](https://tex.z-dn.net/?f=frac%7B12%2A5%2B12%2A9%7D%7B12%2A21%7D%3Dfrac%7B12%285%2B9%29%7D%7B12%2A21%7D%3Dfrac%7B14%7D%7B21%7D%3Dfrac%7B2%7D%7B3%7D)
б)
![frac{14*5-14*2}{28}=frac{14(5-2)}{28}=frac{3}{2}=1,5 frac{14*5-14*2}{28}=frac{14(5-2)}{28}=frac{3}{2}=1,5](https://tex.z-dn.net/?f=frac%7B14%2A5-14%2A2%7D%7B28%7D%3Dfrac%7B14%285-2%29%7D%7B28%7D%3Dfrac%7B3%7D%7B2%7D%3D1%2C5)
в)
![frac{15*17-15*6}{15*17+15*6}=frac{15(17-6)}{15(17+6)}=frac{17-6}{17+6}=frac{11}{23} frac{15*17-15*6}{15*17+15*6}=frac{15(17-6)}{15(17+6)}=frac{17-6}{17+6}=frac{11}{23}](https://tex.z-dn.net/?f=frac%7B15%2A17-15%2A6%7D%7B15%2A17%2B15%2A6%7D%3Dfrac%7B15%2817-6%29%7D%7B15%2817%2B6%29%7D%3Dfrac%7B17-6%7D%7B17%2B6%7D%3Dfrac%7B11%7D%7B23%7D)
г)
![frac{81*17-15*81}{81*17+81*4}=frac{81(17-15)}{81(17+4)}=frac{17-15}{17+4}=frac{2}{21} frac{81*17-15*81}{81*17+81*4}=frac{81(17-15)}{81(17+4)}=frac{17-15}{17+4}=frac{2}{21}](https://tex.z-dn.net/?f=frac%7B81%2A17-15%2A81%7D%7B81%2A17%2B81%2A4%7D%3Dfrac%7B81%2817-15%29%7D%7B81%2817%2B4%29%7D%3Dfrac%7B17-15%7D%7B17%2B4%7D%3Dfrac%7B2%7D%7B21%7D)
д)
![frac{2,4*12,6*3,5}{6,3*4,8*31,5}=frac{1*2*1}{1*2*9}=frac{1}{9} frac{2,4*12,6*3,5}{6,3*4,8*31,5}=frac{1*2*1}{1*2*9}=frac{1}{9}](https://tex.z-dn.net/?f=frac%7B2%2C4%2A12%2C6%2A3%2C5%7D%7B6%2C3%2A4%2C8%2A31%2C5%7D%3Dfrac%7B1%2A2%2A1%7D%7B1%2A2%2A9%7D%3Dfrac%7B1%7D%7B9%7D)
е)
![frac{8,4*2frac{1}{2}*12,1}{1,25*4*1,1}=frac{2,1*2*11}{1*1*1}=2,1*22=46,2 frac{8,4*2frac{1}{2}*12,1}{1,25*4*1,1}=frac{2,1*2*11}{1*1*1}=2,1*22=46,2](https://tex.z-dn.net/?f=frac%7B8%2C4%2A2frac%7B1%7D%7B2%7D%2A12%2C1%7D%7B1%2C25%2A4%2A1%2C1%7D%3Dfrac%7B2%2C1%2A2%2A11%7D%7B1%2A1%2A1%7D%3D2%2C1%2A22%3D46%2C2)
ж)
![frac{2frac{1}{3}*1frac{1}{7}*1frac{1}{5}}{3frac{3}{5}*4frac{2}{3}*6frac{5}{7}}=frac{frac{7}{3}*frac{8}{7}*frac{6}{5}}{frac{18}{5}*frac{14}{3}*frac{47}{7}}=frac{frac{1}{1}*frac{8}{1}*frac{2}{5}}{frac{6}{5}*frac{2}{1}*frac{47}{1}}=frac{frac{16}{5}}{frac{12*47}{5}}=frac{16}{5}*frac{5}{12*47}=frac{4}{3*47}=frac{4}{141} frac{2frac{1}{3}*1frac{1}{7}*1frac{1}{5}}{3frac{3}{5}*4frac{2}{3}*6frac{5}{7}}=frac{frac{7}{3}*frac{8}{7}*frac{6}{5}}{frac{18}{5}*frac{14}{3}*frac{47}{7}}=frac{frac{1}{1}*frac{8}{1}*frac{2}{5}}{frac{6}{5}*frac{2}{1}*frac{47}{1}}=frac{frac{16}{5}}{frac{12*47}{5}}=frac{16}{5}*frac{5}{12*47}=frac{4}{3*47}=frac{4}{141}](https://tex.z-dn.net/?f=frac%7B2frac%7B1%7D%7B3%7D%2A1frac%7B1%7D%7B7%7D%2A1frac%7B1%7D%7B5%7D%7D%7B3frac%7B3%7D%7B5%7D%2A4frac%7B2%7D%7B3%7D%2A6frac%7B5%7D%7B7%7D%7D%3Dfrac%7Bfrac%7B7%7D%7B3%7D%2Afrac%7B8%7D%7B7%7D%2Afrac%7B6%7D%7B5%7D%7D%7Bfrac%7B18%7D%7B5%7D%2Afrac%7B14%7D%7B3%7D%2Afrac%7B47%7D%7B7%7D%7D%3Dfrac%7Bfrac%7B1%7D%7B1%7D%2Afrac%7B8%7D%7B1%7D%2Afrac%7B2%7D%7B5%7D%7D%7Bfrac%7B6%7D%7B5%7D%2Afrac%7B2%7D%7B1%7D%2Afrac%7B47%7D%7B1%7D%7D%3Dfrac%7Bfrac%7B16%7D%7B5%7D%7D%7Bfrac%7B12%2A47%7D%7B5%7D%7D%3Dfrac%7B16%7D%7B5%7D%2Afrac%7B5%7D%7B12%2A47%7D%3Dfrac%7B4%7D%7B3%2A47%7D%3Dfrac%7B4%7D%7B141%7D)
з)
![frac{0,2*6,2:0,31-frac{5}{6}*0,3}{2+1frac{4}{11}*0,22:0,01}=frac{0,2*6,2*frac{100}{31}-frac{5}{6}*frac{3}{10}}{2+frac{15}{11}*frac{22}{100}*100}=frac{0,2*0,2*100-frac{1}{2}*frac{1}{2}}{2+15*2}=frac{4-frac{1}{4}}{2+30}=\3frac{3}{4}:32=frac{15}{4}*frac{1}{32}=frac{15}{128} frac{0,2*6,2:0,31-frac{5}{6}*0,3}{2+1frac{4}{11}*0,22:0,01}=frac{0,2*6,2*frac{100}{31}-frac{5}{6}*frac{3}{10}}{2+frac{15}{11}*frac{22}{100}*100}=frac{0,2*0,2*100-frac{1}{2}*frac{1}{2}}{2+15*2}=frac{4-frac{1}{4}}{2+30}=\3frac{3}{4}:32=frac{15}{4}*frac{1}{32}=frac{15}{128}](https://tex.z-dn.net/?f=frac%7B0%2C2%2A6%2C2%3A0%2C31-frac%7B5%7D%7B6%7D%2A0%2C3%7D%7B2%2B1frac%7B4%7D%7B11%7D%2A0%2C22%3A0%2C01%7D%3Dfrac%7B0%2C2%2A6%2C2%2Afrac%7B100%7D%7B31%7D-frac%7B5%7D%7B6%7D%2Afrac%7B3%7D%7B10%7D%7D%7B2%2Bfrac%7B15%7D%7B11%7D%2Afrac%7B22%7D%7B100%7D%2A100%7D%3Dfrac%7B0%2C2%2A0%2C2%2A100-frac%7B1%7D%7B2%7D%2Afrac%7B1%7D%7B2%7D%7D%7B2%2B15%2A2%7D%3Dfrac%7B4-frac%7B1%7D%7B4%7D%7D%7B2%2B30%7D%3D%5C3frac%7B3%7D%7B4%7D%3A32%3Dfrac%7B15%7D%7B4%7D%2Afrac%7B1%7D%7B32%7D%3Dfrac%7B15%7D%7B128%7D)
и)
![frac{(1,75*frac{2}{5}+1,75:1)1frac{5}{7}}{(frac{17}{40}-0,325):frac{1}{5}*0,4}=frac{(0,7+1,75)frac{12}{7}}{(0,425-0,325)*5*0,4}=frac{2,45*frac{12}{7}}{0,1*2}=frac{4,2}{0,2}=21 frac{(1,75*frac{2}{5}+1,75:1)1frac{5}{7}}{(frac{17}{40}-0,325):frac{1}{5}*0,4}=frac{(0,7+1,75)frac{12}{7}}{(0,425-0,325)*5*0,4}=frac{2,45*frac{12}{7}}{0,1*2}=frac{4,2}{0,2}=21](https://tex.z-dn.net/?f=frac%7B%281%2C75%2Afrac%7B2%7D%7B5%7D%2B1%2C75%3A1%291frac%7B5%7D%7B7%7D%7D%7B%28frac%7B17%7D%7B40%7D-0%2C325%29%3Afrac%7B1%7D%7B5%7D%2A0%2C4%7D%3Dfrac%7B%280%2C7%2B1%2C75%29frac%7B12%7D%7B7%7D%7D%7B%280%2C425-0%2C325%29%2A5%2A0%2C4%7D%3Dfrac%7B2%2C45%2Afrac%7B12%7D%7B7%7D%7D%7B0%2C1%2A2%7D%3Dfrac%7B4%2C2%7D%7B0%2C2%7D%3D21)
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