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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.

(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.

5x-14=40 5x=40+14 5x=54 x=10.8

(1)x-20%x=8 5 , (1-20%)x=8 5 , 0.8x=1.6, 0.8x÷0.8=1.6÷0.8, x=2; (2)60%x+25=40, 0.6x+25-25=40-25, 0.6x=15, 0.6x÷0.6=15÷0.6, x=25; (3)(x-7)÷3=8, (x-7)÷3×3=8×3, x-7=24, x-7+7=24+7, x=31; (4)1 8 ×(x+1 ...

6(x+2.8)=40.8 x+2.8=40.8/6 x+2.8=6.8 x=6.8-2.8 x=4 谢谢,请采纳

(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

这———我不知道对不对试试看吧 (1) X+25%X=2.8 解:X+0.25X=2.8 X+0.25X÷0.25=2.8÷0.25 2X=11.2 2X÷=11.2÷2 X=5.6 (2)25%X-X=44 解:1.25X-X=44 0.25X=44 0.25X÷0.25=44÷0.25 X=1.76 (3) 1-40%X=0.7 解:1-0.4X=0.7 0.6X=0.7 0.6X÷0.6=0.7÷0.6 X=...

x×(1+40%)=2.8 1.4X=2.8 X=2.8/1.4 X=2

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