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(2.8 1.4)x÷2=2.52解方程

(2.8+1.4)x÷2=2.52, 4.2x=2.52×2, 4.2x=5.04, x=5.04÷4.2, x=1.2

(8+18)x÷2=52 解:26x÷2=52 13x=52 x=52÷13 x=4

1.4x=4.2-2.521.4x=1.68x=1.2

解:0.1x=x-2.52 0.9x=2.52 x=2.52➗0.9 x=2.8

(1)23x?49=59, 23x-49+49=59+49, 23x=1, 23x÷23=1÷23, x=112;(2)x+30%x=52, 1.3x=52, 1.3x÷1.3=52÷1.3, x=40;(3)1042=57:x, 10x=42×57, 10x=30, 10x÷10=30÷10, x=3.

答: 2(38+x)=180 两边除以2: 38+x=90 两边减去38: x=90-38 x=52

解方程:(1)x÷0.26=0.52 x÷0.26×0.26=0.52×0.26, x=0.1352;(2)9x-2x=21.7, 7x=21.7, 7x÷7=21.7÷7, x=3.1;(3)3.18×2-2x=4.26, 6.36-2x=4.26, 2x=6.36-4.26, 2x÷2=2.1÷2, x=1.05; (4)0.25x+3.75=12.0.25x+3.75-3.75=12-3.75,...

x=10

3x-2(52-x)=36 3x-104+2x=36 5x=104+36 x=(104+36)/5 =140/5 =28

6.3x=2.52×4 x=9.08÷6.3 x≈0.144

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