解方程:7x-8=5x+2 2x-(5x-3)=3x-4 4(x+1)-2(x-3)=18x-1=4分之1(2x-1) 3x+2(100-x)=300 4x-3(20-x)=6x-7(11-x)
问题描述:
解方程:7x-8=5x+2 2x-(5x-3)=3x-4 4(x+1)-2(x-3)=18
x-1=4分之1(2x-1) 3x+2(100-x)=300 4x-3(20-x)=6x-7(11-x)
答
7x-8=5x+2 7x-5x=8+2 2x=10 x=5
2x-(5x-3)=3x-4 .....................................x=6/7
4(x+1-2(x-3)=18 ..........................x=4
x-1=4/1(2x-1)....................................x=2/3
3x+2(100-x)=300............................x=100
4x-3(20-x)=6x-7(11-x)......................x=17/6
答
3/2,100
答
7x-8=5x+2 x=52x-(5x-3)=3x-4 x=7/64(x+1)-2(x-3)=18 x=4x-1=4分之1(2x-1) x=3/23x+2(100-x)=300 x=1004x-3(20-x)=6x-7(11-x) x=1...