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7(x%2)=2x解方程

7(x-2)=2x 7x-14=2x 7x-2x=14 5x=14 x=14/5

7*(x-2)=2x 7x-14=2x 5x=14 x=2.8

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∵x2+2x-7=0∴x2+2x=7∴x2+2x+1=7+1∴(x+1)2=8∴x=±22-1x1=-22?1,x2=22?1.

2(x➕1)➕7=15 解 2x➕2➕7=15 2x=15➖7➖2 2x=6 x=3

(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...

(x+7):6=7:2.1 (x+7)/6=7/2.1 (x+7)/6=10/3 3(x+7)=60 3x+21=60 3x=39 x=13

(1)9(x-2)=0.45 9(x-2)÷9=0.45÷9 x-2+2=0.05+2 x=2.05(2)7.2x+2.8x=3 10x÷10=3÷10 x=0.3(3)3÷2.5+1.2x=4.8 1.2+1.2x-1.2=4.8-1.2 1.2x÷1.2=3.6÷1.2 x=3.

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