Question

а) 3,8+х=1 4/5

б)5 2/7+х=-3 9/14

Answer 1

3,8+х = 1 4/5

3,8 = 3 8/10 = 3 4/5

 

3 4/5+х = 1 4/5

х = 1 4/5 - 3 4/5

х = -2

 

проверка: 3,8+(-2) = 1 4/5 ; 1,8 = 1,8

 

5 2/7 + = - 3 9/14

37/7+х = -51/14

х = -51/14-37/7

х= (-51-74)/14

х = -125/14= -8 13/14

 

проверка

5 2/7 +(-8 13/14) = -3 9/14

74/14-125/14 = -51/14

-51/14 = -51/14

 

 

 

Answer 2

а)3.8+х=1 4/5

х=1 4/5-3.8

х=1 45-3 810

х=94-3810

х=1810-3810

х=-2010

х=-2

б)5 27+х=-3 914

х=-3 914-5 27

х=-5114-377

х=-5114-7414

х=-12514

х=-8 1314