(37-x)/(67-x)=2/5
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(37-x)/(67-x)=2/5(37-x)/(67-x)=2/5(37-x)/(67-x)=2/5用(67-x)*2=(37-x)*5,解得x=17
(37-x)/(67-x)=2/5
(37-x)/(67-x)=2/5
(37-x)/(67-x)=2/5
用(67-x)*2=(37-x)*5,解得x=17
(37-x)/(67-x)=2/5
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
(X+5)+(X-2)=67 求X
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
x(x-2)-2x(x+1)-3x(x-5) 其中x=负½
(x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3)
x-2x+3x-4x+5x.+99x-100x=25求解
2x+3x+4x+5x+x+6x+7x=100
x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x
f(x,-x)=x^2+2x,fx(x,-x)=5x+1,则fy(x,-x)=
x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=?
x+17=3/5x+67 x+1/5x=18.6 5x+2=x=5
x^5-2x^3+x=?
2/5x=37(58-x)
写过程x(x-1)+2x(x+1)-3x(2x-5)-x(3x-2)+2x(2-x)=-5x(x-2)-4
21分之10x÷3分之2=7分之3x-3分之1x-2分之1x=190x-53x=7408.5x-6.9x=43.3x-200=0.2x+1101.02+0.4x+2.6x=3.428.9x-67=4.5x+656x-58=3x+1410x-20=5x+806x+5=10x-3420-1.4x=9.8x-288.2x+5.4x=272
求下列方程两根的和与积:x^2-3x+2=105x^2+x-5=0x^2+x=5x+67x^2-5=x+8x^2-5x-10=02x^2+7x+1=03x^2-1=2x+5x(x-1)=3x+7