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X÷1.2=2.5解方程

x÷1.2=2.5 x=1.2X2.5 x=0.3x4x2.5 x=0.3x10 x=3

详细步骤如下: (x-0.4)/2.5=1.2,即(x-0.4)=1.2*2.5=3,所以x=3.4

1.2x÷2=60 解:1.2x=120 x=120 ÷ 1.2 x=100

3÷2.5+1.2x=4.8 1.2+1.2x=4.8 1.2x=3.6 x=3 所以原方程的解为x=3.

(1)x+18=52, x+18-18=52-18, x=34,(2)x÷1.2=0.5,x÷1.2×1.2=0.5×1.2, x=0.6,(3)2.5x=1, 2.5x÷2.5=1÷2.5, x= 2 5 , (4)x-4.8=1.6, x-4.8+4.8=1.6+4.8, x=6.4.

2.8x÷1.2=8.4 解:2.8x=8.4×1.2 2.8x=10.08 x=10.08÷2.8 x=3.6

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(1)5.4+2x=8.6, 5.4+2x-5.4=8.6-5.4, 2x=3.2, 2x÷2=3.2÷2, x=1.6;(2)2.5:5=x:8, 5x=2.5×8, 5x=20, 5x÷5=20÷5, x=4;(3)0.2=1-x24, 0.2+x24=1-x24+x24, 0.2+x24=1,0.2-0.2+x24=1-0.2, x24=0.8, x=0.8×24, x=19.2;(4)34...

=1.25X=0.25 = X=0.25/1.25 = X=0.2

2(x-1/2)=8.8 x-1/2=8.8÷2 x-1/2=4.4 x=4.4+1/2 x=4.9 x-5÷6=5/6 x-5/6=5/6 x=5/6+5/6 x=5/3

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