4a^2-5ab-6b^2 a=-1,b=1 2
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(2-ab+2a+5b)-(3ab+2b-2a)-(3a+4b-ab)=2-ab+2a+5b-3ab-2b+2a-3a-4b+ab=a-b-4ab+2=4-4+2=2
很高兴为你a-b=5,ab=6所以(a-b)^2=25(a-b)^2=a^2-2ab+b^2=25所以a^2+b^2=25+2ab=25+12=37由于ab=6,所以a和b肯定同时为正数,或同时为负数
a*a*b*2ab+5a*ab#4ab=(a+a+b+2ab)+(5a+ab-4ab)=7a+b-ab=7*5+3-5*3=35+3-15=23
原式=5a²b(a-b)-3ab(a-b)²-5ab²(a-b)=ab(a-b)[5a-3(a-b)-5b]=ab(a-b)(5a-3a+3b-5b)=ab(a-b)(2
解a²b+ab²-a³b²-a²b³=ab(a+b)-(ab)²(a+b)=-1/5×(4/5)-(-1/5)²×(4/
2(2A+B)-3(A+B)=4A+2B-3A-3B=A-B=5a^3b+2a^4-3a^2b-ab^3-(6ab^3-8a^3b+3a^4-5b^4)=-a^4+13a^3b-3a^2b-7ab^3
1.4a^2bc^3-6a+12.(a+b)^2-1
第一题:-6ab-6a+4a+6ab-5a先把-6ab与6ab消除,剩下-6a+4a-5a=-7a把a=3带入-7a=-21第二题:-1/2a^2b+2a^3+4a^2b-5a^2b-5a^3=-ab
(5a-5b-ab)-(4a-6b-3ab)=5a-5b-ab-4a+6b+3ab=a+b+2ab=3-2x2=-1
(22a+3b-2ab)-(a+4b+ab)-(3ab+2b-2a)=22a+3b-2ab-a-4b-ab-3ab-2b+2a=23a-3b-5ab题目抄差了!(22a+3b-2ab)应该是(2a+3
∵a+b=3,ab=-2,(4a-5b-3ab)-(3a-6b+ab)=4a-5b-3ab-3a+6b-ab=a+b-4ab=3-4×(-2)=11,故答案为:11.
A=5a平方b+2a平方-3a平方b-ab立方B=6ab立方-8a立方b+3a的4次幂-5b的4次方2(2A+B)-3(A+B)=4A+2B-3A-3B=A-B=5a^2b+2a^2-3a^2b-ab
由a(a-1)-(a×a-b)=-5得a^2-a-a^2+b=-5,即a-b=5,(a-b)^2=25.(a×a+b×b)÷2-ab=(a-b)^2÷2=25÷2=12.5
(2a+5b-3ab)-(a+6b-ab)-(2ab+2b-2a)=2a+5b-3ab-a-6b+ab-2ab-2b+2a=3a-3b-4ab=3(a-b)-4ab=12-12=0
-5a^2b+6ab^2-4ab-2a^2b+4ab+3=-5a^2b-2a^2b+6ab^2-4ab+4ab+3=(-5-2)a^2b+6ab^2+3=-7a^2b+6ab^2+36x+2x^2-3
(1)6x+2x-3x+x+1=6x+1其中x=5原式=30+1=31(2)1/3m-3/2n-5/6n-1/6m=1/6m-14/6n=6/1m-7/3n其中m=6,n=3原式=1-7=-6第二题一
a/(a-b)=2得a=2a-2b则a=2b所以(a²+ab)(a-5b)/(a-b)(a²-5ab)=(4b²+2b²)(2b-5b)/(2b-b)(4b&s
(4a^2+3ab-b^2)-(7a^2-5ab+2b^2)=-3a^2+8ab-3b^2=-3(a^2+2ab+b^2)+8ab+6ab=-3(a+b)^2+14ab=-3*6^2+14*(-2)=