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(...
问题描述:
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)
答
x+10+x-15=280-x 2x-5=280-x 3x=285 x=95x+15=327-3x 4x=312 x=7815x-7=12x-1 3x=6x=23x+2.7=5x-8.511.2=2x x=5.613x-...