化简求值(a- 1/2b)〖(a+1/2 b)^2-(a- 1/2b)^2〗*(a^2+ 1/2ab+b^2)-2b(a
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/10/04 16:18:47
化简求值(a- 1/2b)〖(a+1/2 b)^2-(a- 1/2b)^2〗*(a^2+ 1/2ab+b^2)-2b(a^4-1)a=2,b=-1
/>(a- 1/2b)〖(a+1/2 b)^2-(a- 1/2b)^2〗*(a^2+ 1/2ab+b^2)-2b(a^4-1)
=(a-1/2b)[a^2+ab+1/(4b^2)-a^2+ab-1/(4b^2)]*(a^2+1/2ab+b^2)-2b(a^4-1)
=(a-1/2b)*2ab*(a^2+1/2ab+b^2)-2b(a^4-1)
=2a^4b+3a^2b^3/2-ab^4/4-2a^4b+2b
=3a^2b^3/2-ab^4/4+2b
=6-1/2+2=15/2
=(a-1/2b)[a^2+ab+1/(4b^2)-a^2+ab-1/(4b^2)]*(a^2+1/2ab+b^2)-2b(a^4-1)
=(a-1/2b)*2ab*(a^2+1/2ab+b^2)-2b(a^4-1)
=2a^4b+3a^2b^3/2-ab^4/4-2a^4b+2b
=3a^2b^3/2-ab^4/4+2b
=6-1/2+2=15/2
化简求值(a- 1/2b)〖(a+1/2 b)^2-(a- 1/2b)^2〗*(a^2+ 1/2ab+b^2)-2b(a
已知a+b=4,ab=-1,求a+4ab+b 化简求值:(a+2b)(a-2b)-(2a-
化简求值:(a²b-2ab²-b³)÷b-(a+b)(a-b),其中a=1/2,b=-1.
把B=A^2/(A+1)代入【(B-A)/AB】[1-(A-B)]求值.
化简求值:[2a²-(a+b)(a-b)][(-a-b)·(-a+b)+2b²],其中a=-1,b=
化简求值(a∧2b-2ab∧2-b∧3)÷b-(a+b)(a-b),a=二分之一,b=-1
先化简再求值 (a-2b)(a²+2ab+4b²)-a(a-5b)(a+3b),其中a=-1,b=2
先化简,再求值:[a/(a+b)-b/(b-a)-2ab/(a^2-b^2)]/(1/a-1/b),其中a+b=3,ab
1.化简求值:1/2a-1/a-b(a-b/2a-a²+b²),其中a=3-2√2,b=3√2-3.
先化简,再求值.(a-2b)的平方+(a-b)(a+b)-2(a-b)(a-3b),其中a=4/1,b=-3
化简求值先化简,再求值:a方-2ab分之a方-6ab+9b方除以(a-2b分之5b方-a-2b)-a分之1,其中a,b满
(1)先化简,后求值:(a+b/a-b)²×2a-2b/3a+3b÷ab/a²-b²,其中