解方程2(x+1.7)=9.2
解方程2(x+1.7)=9.28x-4x=0.642x-0.24=0.126.2x-x=4167x+2.5x=3.83.8-2)x=14.4....
解方程2(x+1.7)=9.2 8x-4x=0.64 2x-0.24=0.12 6.2x-x=416 7x+2.5x=3.8 3.8-2)x=14.4.
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(1)2(x+1.7)=9.2, 2(x+1.7)=9.2÷2, x+1.7=4.6, x+1.7-1.7=4.6-1.7 x=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÷2 x=0.18; (4)6.2x-x=416, 5.2x=416, 5.2x÷5.2=416÷5.2, x=80; (5)7x+2.5x=3.8, 9.5x=3.8, 9.5x÷9.5=3.8÷9.5, x=0.4; (6)(3.8-2)x=14.4, 1.8x=14.4, 1.8 x÷1.8=14.4÷1.8, x=8. |
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