解方程:(x+10)+(x-15)=280-x x+15=3*(109-x) 5(3x-1.4)=2(6x-0.5) 3
解方程:(x+10)+(x-15)=280-x x+15=3*(109-x) 5(3x-1.4)=2(6x-0.5) 3(x+0.9)=5(x-1.7) 13x-4(...
解方程:
(x+10)+(x-15)=280-x
x+15=3*(109-x)
5(3x-1.4)=2(6x-0.5)
3(x+0.9)=5(x-1.7)
13x-4(2x+5)=17(x-2)-4(2x-1)