80×200+(80-x)(200+10x)+40[800-200-(200+10x)] -50×800=8750
5*(x-2)=4*(x+3) 2x+(50-x)*4=140 3x-(8-x)=20*4 200x=(x-0.5)*2
(1000+80x)÷200+15=5+x
1/10(200-x)+19=1/3x
求最值:y=x+根号下(x²-20x+200) (0<x<10)
求解几道方程.1/2x-20+1/2【x-(1/2x-20)】+20=x-50 x/(200-400/3)+x/(200
有这样一道题:计算(x-y)[(x+y)(x+y)-xy]+(x+y)[(x-y)(x-y)+xy]的值,其中x=200
(X/80+X/100 +5)*40=X,
1/5x-1/2(3-2x)=1,求X .1/7(2x+14)=4-2x,求X .3/10(200+x)-2/10(30
(x+40)*80%-x=12
100+(X-100)/10=200+[X-200-100-(X-100)/10]/10
计算1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)+……+1/(x+2007)(x+200
x+x/3+2x=200