Question

解比例计算题 1. 7:4.2=（x+7）:9 2. 4÷（x+3）=0.6÷1.2

Answer 1

1.7:4.2=（x+7）:9

4.2x+4.2*7=7*9

4.2x=63-29.4

x=33.6/4.2

x=8

2.4÷（x+3）=0.6÷1.2

0.6*（x+3）=2.4*1.2

x+3=2.4*2

x=4.8-3

x=1.8