﹣1-x³分之x²-x+1化成分式的分之和
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1、x×5/9=5/6x=5/6÷5/9=9/6=1.52、x-0.25x=240.75x=24x=24÷0.75=323、7x/7+9x/7=216x/7=2x=2÷16/7x=0.8752:3/4
解原式=x-1分之x的平方-x-1=x-1分之x(x-1)-1=x-1
不等式2分之(x+1)-3分之x
1.7x2-x 44x+x>2-1 45x>1 x>1/45
原式=(x²+x-2x)/(x+1)÷[(x-1)²/(x+1)(x-1)]=(x²-x)/(x+1)÷[(x-1)/(x+1)]=x(x-1)/(x+1)*(x+1)/
原式=[(x+2)/x(x-2)-(x-1)/(x-2)²]*x/(x-1)(x-4)*(x-2)²=(x²-4-x²+x)/x(x-2)²*x/(x
x^3+3x^2-x-3=x^2(x+3)-(x+3)=(x^2-1)(x+3)=(x+1)(x-1)(x+3)
x平方+x+1+(1-x)分之x立方=x平方+x+1+(1-x)分之(x立方-1)+(1-x)分之1=x平方+x+1+(1-x)分之(x-1)(x平方+x+1)+(1-x)分之1=x平方+x+1-(x
原式=[(1-1分之x+5)-(1-1分之x+4))+(1-1分之x+3)-(1-1分之x+2)]*[(x+3)(x+5)]\(x^2+7x+13)=[(1分之x+2)-(1分之x+3)+(1分之x+
log2(x-1)=log4x,则x>1log2(x-1)=log2√xx-1=√x(x-1)²=x
cos(A+B)=cosAcosB-sinAsinBcos²x+sin²x=1A=B=x时候cos2x=cos²x-sin²x=1-2sin²x所以2
(x+3)/(x²-1)÷[(x+3)(x-1)/(﹣x²+2x-1)]=(x+3)/(x²-1)÷[-(x+3)(x-1)/(x²-2x+1)]=(x+3)/
步步高点读机哪里不会点哪里
(x-3)分之x-(x^2-3x)分之(x+6)+x分之1等于几?=x²/x(x-3)-(x+6)/x(x-3)+(x-3)/x(x-3)=(x²-x-6+x-3)/x(x-3)=
=[(x+2)/x(x-2)-(x-1)/(x-2)²]×x/(4-x)=[(x²-4-x²+4)/x(x-2)²]×x/(4-x)=1/(x-2)²
①X平方+2X分之X+2-X平方-4X+4分之X-1=(x+2)/x(x+2)-(x-1)/(x-2)²=[(x-2)²-x²+x]/x(x-2)²;=(4-3
x²/(x-1)+x/(1-x)=x²/(x-1)-x/-(1-x)=x²/(x-1)-x/(x-1)=x²-x/(x-1)=x(x-1)/(x-1)=x
原式=[(x+2)/x(x-2)-(x-1)/(x-2)²]÷(4-x)/x=[(x+2)(x-2)/x(x-2)²-x(x-1)/x(x-2)²]÷(4-x)/x=[(