a(3x-2) b(2x-3)=当a,b满足什么条件时,方程有无数个解-搜答案-灵鹊做题网

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A+B=2x^2-6x+3A-B=X^2-7x+5则(A+B)-(A-B)=(2x^2-6x+3)-(x^2-7x+5)A+B-A+B=2x^2-6x+3-x^2+7x-52B=x^2+x-2B=x^

A\(x-1)+B\（2-x)=[A(x-2)-B(x-1)]/(x-1)(x-2)=[(A-B)x+(-2A+B)]/(x²－3x＋2)∴(3x-1)\(x²-3x+2）=)=[

(3x-22)/(x+2)(x-5)=a(x-5)-b(x+2)/(x+2)(x-5)————右边通分=(ax-5a-bx-2b)/(x+2)(x-5)=[(a-b)x-(5a+2b)]/(x+2)(

x*2x=4x4x*3x=11x11x*4x=26x26x*5x=57x57x*6x=120x120x*7x=247x247x*8x=502x502x*9x=1013x=3039x=3

题目是不是：a(x*x+x-c)+b(2x*x-x-2)=7x*x+4x+3?a(x*x+x-c)+b(2x*x-x-2)=7x*x+4x+3,即（a+2b)x^2+(a-b)x-(ac+2b)=7x

｛3x^2(a^2+b^2)-3a^2b^2+3[x^2+(a+b)x+ab]*[x(x-a)-b(x-a)]}/2x^2=3/2{x^2a^2+x^2b^2-a^2b^2+[x^2+(a+b)x+a

A/(x-5)+B/(x+2)=(5x-4)/(x^2-3x-10)两边乘以(x^2-3x-10),得A(x+2)+B(x-5)=5x-4(A+B-5)x+2A-5B+4=0得到A+B-5=0,2A-

1、通分得3X-4/(x-1)(x-2)=[A(X-2)+B(X-1)]/(x-1)(x-2)把A(X-2)+B(X-1)整理成（方程左边的格式即）(A-B)X-(2A+B)所以A-B=32A+B=4

AnB=B,则B是A的子集B为空集,16-4a=4B不是空集,即a

由题意得当x*x+x-2=0时原多项式=0所以当x=1,-2时原多项式=2x*x*x*x-3x*x*x+ax*x+7x+b=0即2*1*1*1-3*1*1+a*1*1+7*1-b=0且2*(-2)*(

(A/X-5)+(B/X+2)=5X-4/X^2-3X-10,[(A+B)x+(2A-5B)]/(x^2-3x-10)A+B=5,2A-5B=-4.A=3,B=2.

两边乘以(x-2)(x-5)得3x=A(x-5)+B(x-2)3x=(A+B)x+(-5A-2B)∴A+B=3-5A-2B=0解这个方程组得A=-2B=5

把左边展开x^3+(3-a)x-2b=x^3+5x+4对应系数相等3-a=5-2b=4所以a=-2b=-2

x^2-6x+5=(x-5)(x-1)(x-2)(x-3)=x^2-5x+6,A错(x-6)(x+1)=x^2-5x-6,B错

解题思路：集合基本关系解题过程：见附件最终答案：略

方成两边同乘（x+3）（x-2）（x-3）后整理得（A+B-5）x2+（B-10)x-9A-6B-15=0A+B-5=0B-10=09A+6B+15=0得A=-5B=10

小状元AAA：A-B=(x²-x+b)-(x²-ax+3)=x²-x+b-x²+ax-3=(a-1)x+b-3=x+2∴a-1=1b-3=2解得a=2,b=5∴

首先解出A:即有x²-2x-3

再问：求求大神能把方程左边写一下吗，求再答：