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1.2x%2.5=0.8x+7.5,x=?

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

方程一: 8X-4(6X-0.8)=1.6 8x-24x+3.2=1.6 -16x=-1.6 16x=1.6 x=0.1 方程2: 2.5(X-8)=7.5 2.5x-20=7.5 2.5x=27.5 x=11 方程3: 5.4﹢4.8X=1.8X﹢6 4.8x-1.8x=6-5.4 3x=0.6 x=0.2

2x-五分之四x=60 解:(2-4/5)x=60 6/5x=60 x=60÷6/5 x=50 x+40%x=3.5 解:(1+40%)=3.5 1.4x=3.5 x=3.5÷1.4 x=2.5

=125×0.8×246 =100×246 =24600 例5、(2.5+12.5)×40 =2.5×40+12...3.75x99x2+7.5=3.75×2×99+7.5=7.5×99+7.5=7.5×(99+1)=7.5×100=750...

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