Question

x/3+(100-x)*2=100解方程

Answer 1

x/3+(100-x)*2=100
解：两边同时乘以3得
x+6（100-x）=300
x+600-6x=300
300=5x
x=60

追问

7-x/4=x-3 4(x+5)=2-3(2x-7)

追答

7-x/4=x-3 4(x+5)=2-3(2x-7)
解：两边同时乘以4得 4x+20=2-6x+21
28-x=4x-12 10x=3
40=5x x=3/10
x=8

Answer 2

解：x/3+(100-x)×2=100 x/3+50-x/2=100 5x/6=50 5x=300 x=60

追问

2(x-3)+3(2x-1)=5(x+3) 7-x/4=x-3 4(x+5)=2-3(2x-7)
3(x+13)-5(1-x)=13(x-1) 3(x-2)=2-5(x-2) 3(x+1)-2(x+2)=2x-3