作业帮12a^3-12a^2 3ab^2
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/17 06:49:38
原式=-4ab*(ab^2)-4b^2+3),提公因式啊.
3ab+a2a2−b2÷a+3ba−b=a(a+3b)(a+b)(a−b)•a−ba+3b=aa+b．
a²+b²=（a+b）²-2ab=9+24=33a-b=√（a-b）²=√a²+b²-2ab=√33+24=√57再问：我问的是a+b=多少
解去括号合并同类项得3a+3b-ab=3(a+b)-ab=24
a²+b²=（a+b)²-2ab=25a²+ab+b²=25+12=37a²+3ab+b²=25+36=61
(3ab-2b)+{3a-(5ab-12b-2a)}=3ab-2b+3a-5ab+12b+2a=-2ab+5a+10b=2×（-3）+5(a+2b)=-6+5×(-5)=-31
a+b=3平方a²+2ab+b²=9所以a²+b²=9-2ab=9+24=33a²-ab+b²=33+12=45(a-b)²=a&
=3ab(a-b)³-12a(a-b)=3a(a-b)[b(a-b)²-4]=3a(a-b)(a²b-2ab²+b³-4)再问：接下来呢，这不是最简的
1.4a^2bc^3-6a+12.(a+b)^2-1
a^2-ab+b^2=(a+b)^2-3ab=3^2-3*(-12)=45
(1)-4a^2b^3+16ab^2-12ab=-4ab(ab²-4b+3)(2)6x^3y^2+12x^2y^3-6x^2y^2=6x²y²(x+2y-1)(3)(x-
∵ab=-3.∴b=-3/a.将b=-3/a代入a+2b=-5得：a+2(-3/a)=-5a-6/a=-5a-6=-5aa+5a-6=0(a+6)(a-1)=0∵a+6=0∴a1=-6；∵a-1=0∴
a^2-ab+b^2=(a+b)^2-3ab=45
(a+b)²=49a²+2ab+b²=49把ab=12代入a²+24+b²=49得：a²+b²=25所以,a²-ab+b
a^2+b^2=(a+b)^2-4ab=9-(-24)=33(a-b)^2=a^2+b^2-2ab=33+24=57x^2+4y^2-1=(x-2Y)^2-4xy-1=225+100-1=324x-y
(a+b)^2=a^2+b^2+2ab=9a^2+b^2=9-2ab=33a^2-ab+b^2=9-3ab=45(a-b)^2=9-4ab=57
原式=-(9a^4-18a^3+3b^2+4a^3b)=-(9a^4-14a^3b+3b^2)=-(9*1-14*(-1)^3*(-2)+3*(-2)^2)=-(9-28+12)=7
∵a+b=3，∴（a+b）2=9，∴a2+b2+2ab=9，∵ab=-12，∴a2+b2=9-2ab=9-2×（-12）=33，∴a2-ab+b2=33-（-12）=45．
（2A+3B-2AB）-（AB+A+4B）-（3AB-2A+2B）=3A-3B-6AB=3(A-B)-6AB=-1×3－6×12＝－75
a^(n+1)b^n-4a^(n+2)+3ab^n-12a^2=a^(n+1)(b^n-4a)+3a(b^n-4a)=(b^n-4a)[a^(n+1)+3a]=a(b^n-4a)(a^n+3)