[4a^2b^2(3b^2-5ab)-a^2(-2b)^3]/8a^2b^3

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/17 23:02:21

[4a^2b^2(3b^2-5ab)-a^2(-2b)^3]/8a^2b^3
（5*10^5）*(-6*10^-2)/(-1/2*10^-2)=?
[(1/2x+y)^2-(1/2x-y)^2]/(-4xy)=?
已知a+b=2/3 ,ab=2求代数式a^2b+2a^b^2+ab^3的值
已知A=3x^2-2y+1 B=x^2-y 求（1）A-2B （2）A*B

解原式=4a^2b^3(3b^2-5a+2)/(8a^2b^3).
=(1/2)(3b^2-5a+2).
原式=5*(-6)*(-2)(10^(5-2+2).
=60*10^5.
=6*10^6.
原式=[(1/2x+y+1/2x-y)(1/2x+y-(1/2x-y)]/(-4xy.
=2xy/(-4xy).
=-1/2.
原式=a^3b+2a^2b^2+ab^3 .[原题求:a^2b+2a^b^2+ab^3,可能有误]
=ab(a^2+2ab+b^2)
=ab(a+b)^2.
=2*(2/3)^2.
=8/9.
已知:A=3x^2-2y+1.B=x^2-y,
求(1) A-2B.
A-2B=3x^2-2y+1-2*(x^2-y).
=3x^2-2y+1-2x^2+2y.
=x^2+1.
(2) A*B=(3x^2-2y+1)*(x^2-y)
=3x^4-3x^2y-2x^2y+2y^2+x^2-y.
=3x^4-5x^2y+x^2-y+2y^2.
=3x^4-(5y-1)x^2+2y^2-y.

因式分解a^+b^+2a^b+2ab^+a^+b^+3ab+a+b (a-2b)(a^2-2ab+4b^2)-a(a-5b)(a+3b) 已知a-b=5,ab=-4,求代数式5a^2b(a-b)-3ab(b-a)^2+5ab^2(b-a)的值已知3a*a+ab-2b*b=0(a不等于0,b不等于0),求a/b-b/a-(a*a+b*b)/ab的值. 3ab+3b²/b(a²+2ab+b²) ×a²-b²/a-b ÷b/ 计算(3a-2b)(9a*a+6ab+4b*b)-(3a+2b)(9a*a-6ab+4b*b) a^5+a^4b+a^3b^2+a^2b^3+ab^4+b^5 因式分解 -2ab(3a^2-2ab-4b^2) (2b-a)b-（2a-b）a A=B+B+B+B+B+B+B+B+B+B+B+B+B+B+B A-B×3=C C+2×7+2=1 已知实数a,b满足ab=-1/5,a+b=4/5,求a^2b+ab^2-a^3b^2-a^2b^3 (a+b/a-b)²×2a-2b/3a+3b÷ab/a²-b² 已知a^2+ab+b^2|ab(a+b),求证(a-b)^3>3ab