(40-x)(40+4x)=2400
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(4x-40)+x=420 x=?
40-x=4(x+5)
4(X+5)+X=80 5X+10=3X+4(X+5)+X=80 5X+10=3X+40
(40-x)(40+4x)=2400
60%x+25=40 x+30%x=52 19-120%x=7 4分之3x-5%x=17.5 x-10%x=18 (1-25%)x=36 2x+30%x=9.2
(x+1)(x+2)(x-4)(x-5)=40
1/4x+5+1/2【x-(1/4x+5)】-5+40=x
x除55%=100 60%x=30 x+50%x=4.5 (1-25%)x=72 4x+40%x=176 解方程
已知两个函数f(x)=7x-28x-c,g(x)=2x+4x-40x
4x+x=40x
(40-40x)x+40x=40-32.4
(x-3)/x=40% x=?
8x=9x×(x-40)
(X/80+X/100 +5)*40=X,
x(40-2x)=250求x
2(15+2x)x+40x=246
(x+6)/(40+x)=20%求x.
急:4*[x+(40x-4x)/(50+4)]+40[y-(40x-4x)/(50+4)]=40x+4yx/4=[(y-x)/40]+[(y—x—x)/50](要求过程详细)