(X-80)(X-20)=80(X+20)
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(X-80)(X-20)=80(X+20)(X-80)(X-20)=80(X+20)(X-80)(X-20)=80(X+20)x^2-100x+1600-80x-1600=0x^2-180x=0x(x
(X-80)(X-20)=80(X+20)
(X-80)(X-20)=80(X+20)
(X-80)(X-20)=80(X+20)
x^2-100x+1600-80x-1600=0
x^2-180x=0
x(x-180)=0
x=0
x=180
xx-100x+1600=80x+1600
xx-180x=0
x(x-180)=0
x=0或x-180=0
x=0或x=180
x^2-20x-80x+1600=80x+1600
x^2-180x=0
x(x-180)=0
x=0或x=180
20+0.8x=x-14 112-4x=2x(80-4x)
(X-80)(X-20)=80(X+20)
x=x/2+20+80 x等于多少?
150%x乘80%x-x=20怎么解?
:(0.5x+20)+x+(3x-80)=507
20x-20+80%x=12
1.5X*80%=X+20 方程
80-x/x=-20% 怎麼算
(x-20)/x=80%怎么解
x-(20+80%x)=5
50%X+20=80%X-40
80x+50(20-x)=1450
80x+20=100-2x
3x*x=1600+x*x-80x
方程“(80-X)*20/X =X*7.2/(80-X)
84+X=X*(1+20%)*80%84+X=X*(1+20%)*88%
83x+78(x+20)=80(2x+20) x=
83x+78(x+20)=80(2x+20) x=