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解方程2(x+1.7)=9.2

(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...

2(x+1.7)=9.2 x+1.7=9.2÷2 x+1.7=4.6 x=4.6-1.7 x=2.9

x=9.2÷2-1.7 x=2.9

(1)2(x+1.7)=9.2, 2x+2×1.7=9.2, 2x+3.4-3.4=9.2-3.4, 2x=5.8, 2x÷2=5.8÷2, x=2.9;(2)3x-4×4.5=6.36, 3x-18=6.36, 3x-18+18=6.36+18, 3x=24.36, 3x÷3=24.36÷3, x=8.12;(3)7x+2.5x=3.8, 9.5x=3.8, 9.5x÷9.5=3.8÷9.5, x=0....

解: 2(x+1.7)=9.2 2(x+1.7)÷2=9.2÷2 x+1.7=4.6 x+1.7-1.7=4.6-1.7 x=2.9

x+1.7=9.2÷2=4.6 x=4.6-1.7=2.9

①(x+1.7)×2=9.2, (x+1.7)×2÷2=9.2÷2, x+1.7=4.6, x+1.7-1.7=4.6-1.7, x=2.9;②8x-4x=0.64,x(8-4)=0.64, 4x=0.64, 4x÷4=0.64÷4, x=0.16;③2x-0.24=0.12,2x-0.24+0.24=0.12+0.24, 2x=0.36, 2x÷2=0.36÷2, x=0.18;④7x+2.5X=3.8...

(1)2(x+1.7)=9.2,2(x+1.7)÷2=9.2÷2, x+1.7-1.7=4.6-1.7, x=2.9;(2)1.2x÷2=60, 1.2x÷2×2=60×2, 1.2x=120, 1.2x÷1.2=120÷1.2, x=100;(3)2x-0.6×4=0.12, 2x-2.4+2.4=0.12+2.4, 2x=2.52, 2x÷2=2.52÷2, x=1.26;(4)16×0.5+...

7(X-1.2)=2.1, 7X-8.4=2.1,7X=10.5,X=1.5

2x+3.4=9.2 2x=5.8 x=2.9

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