已知(x减1)(x减2))分之3x减4等于x减一分之a加x减2分之b,求实数ab-搜答案-百度作业网

原式=(x^2-1)/x÷(x^2+x)/x^2=(x-1)(x+1)/x*x^2/x(x+1)=x-1当x=2时,原式=2-1=1

x-3=1/xx（x-3）=1x²-3x+2=x（x-3）+2=1+2=3

x=2/(√5-3)=-(3+√5)/2‘分母有理化x+3/2=-√5/2移项(x+3/2)²=5/4两边平方x²+3x+9/4=5/4x²+3x=-1x(x+1)(x+

(x减2)乘(x加5)分之4x加1等于x加五分之a加x减2分之b(4x+1)/(x-2)(x+5)=a/(x+5)+b/(x-2)(4x+1)/(x-2)(x+5)=(ax-2a+bx+5b)/(x-

[(x-1)/2]-(x/3)=13(x-1)-2x=6x=9√x/(x+2)=3/11

x+1/x=√13两边平方x²+2+1/x²=13x²+1/x²=11(x-1/x)²=x²-2+1/x²=11-2=9所以x-1

3x-1＜2x+2x＜3A={x|3x-1＜2x+2}={x|x＜3}2(x+1)/3≥6-x/32x+2≥18-x3x≥16x≥16/3B={x|2(x+1)/3≥6-x/3}={x|x≥16/3}

x+1分之3减x-2分之6=(x+1)(x-2)分之x-m(x+1)(x-2)分之（3x-6-6x-6）=(x+1)(x-2)分之x-m(x+1)(x-2)分之（-3x-12）=(x+1)(x-2)分

已知x²-7x-1=0所以x²-1=7x所以x-1/x=7故1/x-x=-7如果不懂,请Hi我,祝学习愉快!

因为：x(x+1)(x+2)(x+3)=x(x+3)(x+1)(x+2)=(x²+3x)(x²+3x+2)而因为x=(√5-3)/2代入x²+3x得x²+3x=

x²-3x=-1即x²+1=3xx+1/x=3

1题目是：x²/(x²-2)=3,求[1/(1-x)-1/(1+x)]/[x/(x²-1)+x]吧?如果是这样,那么由x²/(x²-2)=3得,x&#

x²-11x+1=0,求x²+1/x²原式/x=x-11+1/x=0x+1/x=11(x+1/x)²=11²x²+2+1/x²=1

由已知条件可得：x-y=-4xy,（也就是在等式两边乘xy后整理,即可）,代入所求的式子里分母为-4xy+7xy,即3xy；分子为-4xy-2xy,即-6xy,化简得-2

（x+2）（x+3）分之2x-1等x+2分之a减x+3分之b(2x-1)/[(x+2)(x+3)]=[a(x+3)-b(x+2)]/[(x+2)(x+3)](2x-1)/[(x+2)(x+3)]=[(

根号X-根号X分之一=2二边平方得:x-2根号X*根号1/X+1/x=4即X+1/X=4+2=6平方得:X^2+2+1/X^2=36所以,X^2+1/X^2=34

(x+2/x)=4所以x^2+4+4/x^2=16x^2+4/x^2=12而(x-2/x)^2=x^2-4+4/x^2=8所以x-2/x=±√8=±2√2