20%x+28=3/2x这个方程怎么解?
问题描述:
20%x+28=3/2x这个方程怎么解?
答
0.2x-1.5x=-28
1.3x=28
x=280/13
答
20%x+28=3/2 x
3/2 x-1/5 x=-28
13/10x=-28
x=-280/13
答
(3/2)x -(1/5)x=28
[(15-2)/10]x=28
x=280/13
答
用一元二次方程方式解。
4X方+560X=30
2(X方+140X+4900)=9800+15
....
开方求解。。。
答
20%x+28=3/2 x
3/2 x-1/5 x=28
13/10 x=28
x=28×10/13
x=280/13
答
28=(3/2-1/5)x
x=280/13