解方程x(1+50%)*80%-x=28

解方程x(1+50%)*80%-x=28


x(1+50%)*80%-x=28
1.5x*0.8-x=28
1.2x-x=28
0.2x=28
x=140



解方程:60÷(x÷2-60)=(x÷2+80)÷(x-80)x=?


60÷(x÷2-60)=(x÷2+80)÷(x-80)
兩邊同乘4(x÷2-60(x-80)得240(x-80)=(x+160)*(x-120)
240x-19200=x^2+40x-19200
200x=x^2
所以x=0或x=200.



解方程:要過程:80%(1+50%)x-x=270


80%(1+50%)x-x=270
1.2x-x=270
0.2x=270
x=5400



解方程3.5÷×=5÷4.2 21分之8=0.6÷×


⑴x=2.94
⑵x=1.575