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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...

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...

x+1.7=9.2÷2=4.6 x=4.6-1.7=2.9

1+1/7(x-1)=2+1/7{x-[1+1/7(x-1)]-2}, 两边乘以7,得到7+x-1=14+x-1-1/7(x-1)-2, 1/7(x-1)=5, x-1=35, x=36

计算 1.9(x+0.5)=1.7(x+3.2) 1.9x+0.95=1.7x+5.44 x=(5.44-0.95)/(1.9-1.7) =4.49/0.2 =22.45

3x-7x+7+2x+2*3 -3=0,-2x+10=0,x=5

1/2+7/12-x=2/3 两边同乘以12,得 6+7-12x=8 12x=13-8 12x=5 x=5/12 2-5x=7/4 两边同乘以4,得 8-20x=7 20x=1 x=1/20

(x-1.7)/0.4=2.5 x-1.7=1 x=2.7

解:-4+2x-3+6x=7-7x+10-5x 2x+6x+7x+5x=7+10+4+3 20x=24 x=1.2

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