方程:1.7x+0.5x=4.

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方程:1.7x+0.5x=4.方程:1.7x+0.5x=4.方程:1.7x+0.5x=4.1.7x+0.5x=4.42.2x=4.4x=4.4/2.2x=21.7x+0.5x=4.42.2x=4.4x

方程:1.7x+0.5x=4.
方程:1.7x+0.5x=4.

方程:1.7x+0.5x=4.
1.7x+0.5x=4.4
2.2x=4.4
x=4.4/2.2
x=2

1.7x+0.5x=4.4
2.2x=4.4
x=2

2.2*=4.4 *=2

原式:2.2x=4.4 x=2