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解方程2(x+1.7)=9.2

(1)2(x+1.7)=9.2, 2(x+1.7)=9.2÷2, x+1.7=4.6,x+1.7-1.7=4.6-1.7x=2.9;(2)8x-4x=0.64, 4x=0.64,, 4x÷4=0.64÷4,x=0.16; (3)2x-0.24=0.12,2x-0.24+0.24=0.24+0.12, 2x=0.36, 2x÷2=0.36÷2x=0.18;(4)6.2x-x=416, 5.2x=41...

(1)2(x+1.7)=9.2, 2x+2×1.7=9.2, 2x+3.4-3.4=9.2-3.4, 2x=5.8, 2x÷2=5.8÷2, x=2.9;(2)3x-4×4.5=6.36, 3x-18=6.36, 3x-18+18=6.36+18, 3x=24.36, 3x÷3=24.36÷3, x=8.12;(3)7x+2.5x=3.8, 9.5x=3.8, 9.5x÷9.5=3.8÷9.5, x=0....

x=9.2÷2-1.7 x=2.9

解: 2(x+1.7)=9.2 2(x+1.7)÷2=9.2÷2 x+1.7=4.6 x+1.7-1.7=4.6-1.7 x=2.9

x+1.7=9.2÷2=4.6 x=4.6-1.7=2.9

2x+3.4=9.2 2x=5.8 x=2.9

7(X-1.2)=2.1, 7X-8.4=2.1,7X=10.5,X=1.5

2x+3.4=9.2 2x+3.4-3.4=9.2-3.4(可省略) 2x=5.8 x=2.9

3.4x+2=4.5x-2 4.5x-3.4x=2+2 1.1x=4 x=4/1.1 x=40/11

2(x^2+1)/(x+1)+6(x+1)/(x^2+1)=7, 设y=(x^2+1)/(x+1),则2y+6/y=7. 还需要继续吗?

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