2X+4(8-X)=20 10X-6(10-X)=36 10X-6(16-X)=64 0.5X+0.1(8-X)=2 4X-2(8-X)=14
问题描述:
2X+4(8-X)=20 10X-6(10-X)=36 10X-6(16-X)=64 0.5X+0.1(8-X)=2 4X-2(8-X)=14
用移项解方程
答
2X+4(8-X)=20
2x+32-4x=20
-2x+12=0
x=6
10X-6(10-X)=36
10x-60+6x=36
16x=96
x=6
10X-6(16-X)=64
10x-96+6x=64
16x=160
x=10
0.5X+0.1(8-X)=2
0.5x+0.8-0.1x=2
0.4x=1.2
x=3
4X-2(8-X)=14
4x-16+2x=14
2x=30
x=15