Question

解方程：5x+3（9-x）=41 5x+10(25-x）=170 2x+4(10-x)=32 急 要求,有过程,务必详细

Answer 1

5x+3（9-x）=41

5x+27-3x=41

5x-3x=41-27

2x=14

x=14/2

x=7

5x+10(25-x）=170

5x+250-10x=170

10x-5x=250-170

5x=80

x=80/5

x=16

2x+4(10-x)=32

2x+40-4x=32

4x-2x=40-32

2x=8

x=8/2

x=4