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解方程2.5X%1

(1)2.5X-120%X=6.5, 1.3X=6.5, 1.3X÷1.3=6.5÷1.3, X=5;(2)3X+60%×4=9, 3X+2.4=9, 3X+2.4-2.4=9-2.4, 3X=6.6, 3X÷3=6.6÷3, X=2.2.

2.5x+1.5x-1.2x=14 (2.5+1.5-1.2)x=14 2.8x=14 x=5

①2.5x-1.3x=24, 1.2x=24, 1.2x÷1.2=24÷1.2, x=20;② 3 8 x=20, 3 8 x÷ 3 8 =20÷ 3 8 , x= 160 3 ;③x+3.8x=12, 4.8x=12,4.8x÷4.8=12÷4.8, x=2.5;把x=2.5代入原方程,左边=2.5+3.8×2.5=2.5+9.5=12,右边=12,左边=右边,所以,x=2.5是...

3.2x-2.5x=4.3-1.2 0.7x=3.1 x=31/7

3.2x-2.5x=4.3-1.2 后面你应该会了

x+2/9=5/6 x=5/6-2/9 =15/18-4/18 =11/18 2.5X+1=6.5 2.5x=6.5-1=5.5 x=5.5/2.5 =2.2

2.5x+4.3=3.2x+1.2 2.5x-3.2x=1.2-4.3 -0.7x=-3.1 x=3.1/0.7 x=31/7

化简: (2.5-1.3)X=3 X=3/(2.5-1.3) X=2.5

(1)x+57x=6, 127x=6, 127x÷127=6÷127, x=72;(2)2.5x÷2=1, 2.5x÷2×2=1×2, 2.5x÷2.5=2÷2.5, x=45.

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