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解方程2.8x 14

提取x :x(5.4-2.6)=14 化简 : 2.8x=14 : x=14/2.8 : x=5

x=10

解:解方程, 此方程的解为x = 1/5,【即x = 0.2】 2.8x = 14/25 [(2*10+ 8)/10]x = 14/25 (28/10)x = 14/25 (14/5)x = 14/25 x = 14/25 ÷ 14/5 x = 14/25 * 5/14 x = 1/5 ∴x = 0.2 答:此方程的解为x = 1/5,【即x = 0.2】

3.5x-0.7x=14解:(3.5-0.7)x=142.8x=14x=5

可以看成是1.8X+1X=142.8X=14X=5

2.8x-1.6=4.62.8x=4.6+1.6=6.2x=6.2/2.8=62/28=31/14

2.8X=19.8+7.22.8X=27X=27÷2.8X=9又14分之9

(2.8-1)x=18.181.8x=18.18x=1.1 啊对,10.1

2.8x÷2=7 2.8x=14 x=5 谢谢

2.8x=14x=5

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