解方程: 30+10(x-6)=30 6x-7=5x+4 4(4x-11)=3(22-2x) 7(2x-6)=84 5(x-8)=3x 4.2x-9=2.5x+2.9
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30+10(x-6)=30: 10(x-6)=0, 10x-60=0, x=6
6x-7=5x+4: 6x-5x=4+7, x=11
4(4x-11)=3(22-2x): 16x-44=66-6x, 22x=110, x=5
7(2x-6)=84: 12x-42=84, 14x=126, x=9
5(x-8)=3x: 5x-40=3x, 2x=40, x=20
4.2x-9=2.5x+2.9: 4.2x-2.5x=2.9+9, 1.7x=11.9, x=7
6x-7=5x+4: 6x-5x=4+7, x=11
4(4x-11)=3(22-2x): 16x-44=66-6x, 22x=110, x=5
7(2x-6)=84: 12x-42=84, 14x=126, x=9
5(x-8)=3x: 5x-40=3x, 2x=40, x=20
4.2x-9=2.5x+2.9: 4.2x-2.5x=2.9+9, 1.7x=11.9, x=7
追问
请把9(2x-3)-2=5(2x-1)的答案写出
我一定加分,采纳!!!
追答
9(2x-3)-2=5(2x-1): 18x-27-2=10x-5, 18x-10x=29-5, 8x=24, x=3
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