Question

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

Answer 1

5x+3（9-x）=41

5x+27-3x=41

2x+27=41

2x=41-27

2x=14

x=14/2

x=7

5x+10(25-x）=170

5x+250-10x=170

250-170=10x-5x

80=5x

x=80/5

x=16

2x+4(10-x)=32

2x+40-4x=32

40-32=4x-2x

8=2x

x=8/2

x=4