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解方程(1)40%x%2.8=7.6(2)

(1)40%x-2.8=7.6, 40%x-2.8+2.8=7.6+2.8, 40%x=10.4, x=10.4÷40%, x=26,(2)x+20%x=3.6, 1.2x=3.6, x=3.6÷1.2, x=3,(3)90%x-60%x=48 30%x=48, x=48÷30%, x=160.

x×(1+40%)=2.8 1.4X=2.8 X=2.8/1.4 X=2

(1)40%x+1.2=4.8, 40%x+1.2-1.2=4.8-1.2, 40%x=3.6, 40%x÷40%=3.6÷40%, x=9;(2)X:12=0.7:2.8, 2.8X=12×0.7, 2.8X=8.4, 2.8X÷2.8=8.4÷2.8, X=3;(3) x 4 = 3.5 1.5 , 1.5x=3.5×4, 1.5x=14,1.5x÷1.5=14÷1.5, x=9 1 3 .

7(0.4x+4)=16(x+4) 2.8x+28=16x+64 13.2x= - 36 x= - 30/11 正确否?

设这个数为X 则:5X+0.5=50 5X=49.5 X=9.9

5x+5=40 5x=35 x=7

(1)x+15%x=115 115%x=115 x=100 (2)x-50%x=1000 50%x=1000 x=2000 (3)x÷25%=40 x=10 (4)60%x+80%x=2.8 140%x=2.8 x=2

原式 =[(x+2)/(x-2)]-[8x/(x+2)(x-2)]×[(x+2)/x(x-2)] =[(x+2)/(x-2)]-[8/(x-2)平方] =[(x+2)(x-2)/(x-2)平方]-[8/(x-2)平方] =(x平方-12)/(x-2)平方

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