Question

Решите уравнения 5 класс:1)5m+7m=132
2)42x-28x+180=600

Answer 1

5м+7м=132
12м=132
м=132:12
х=11

42х-28х+180=600
14х=600-180
14х=420
х=420:14
х=30

Answer 2

5м+7м=132           42х-28х+180=600

12м=132               14х+180=600

м=132:12              14х=600-180

м=11                     14х=420

                              х=420:14

                              х=30