Question

помогите решить даю 30 баллов
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Answer 1

Ответ:

A)0,5

B) 18 1/2

C) -1 3/18

D) -1/15

Пошаговое объяснение:

A) 4÷(5 1/3 + 2 2/3)= 4÷8=0,5

B) (-1/12 + 6 1/4)×3=(-1/12+6 3/12) × 3 = 6 1/6 × 3= 37/6 × 3/1= 37/2 = 18 1/2

C) 6×(7 4/9 - 8 5/18) = 6× (7 8/18 - 8 5/18) = -1 3/18

D) -1/4 × (-1 1/15) ÷ (-4) = -1/4 × (-16/15) × (-1/4)= 16/60×(-1/4)=4/15×(-1/4) = -1/15

Answer 2

Ответ:

$a) 4/(5\frac{1}{3} +2\frac{2}{3} )=4/(7\frac{1+2}{3}) = 4/8=\frac{1}{2} \\\\b)(-\frac{1}{12} +6\frac{1}{4} )*3=(-\frac{1}{12} +6\frac{3}{12} )*3=6\frac{3-1}{12}*3=6\frac{2}{12} *3=6\frac{1}{6} *3=6*3+\frac{1}{6} *3=18\frac{1}{2} \\\\c) 6*(7\frac{4}{9} -8\frac{5}{18} )=6*(7\frac{8}{18} -8\frac{5}{18})=6*(7-8+\frac{8-5}{18} )=\\\\= 6*(-1+\frac{3}{18} )=6*(-1+\frac{1}{6})=6* (-\frac{5}{6} )=-5\\\\\\d)-\frac{1}{4} *(-1\frac{1}{15}) /(-4) = -\frac{16}{15} *\frac{1}{4*4} =-\frac{1}{15}$