a(a-2b) (a b)其中a=-1b=根号2

(a-1)²+|b+1|=0a-1=0、b+1=0解得：a=1、b=-13ab-2(a²-ab)-(a²-ab)=3ab-3(a²-ab)=3ab-3a

(b)/(a-b)-(b^3)/(a^3-2a^2b+ab^2)÷(ab+b^2)/(a^2-b^2)=(b)/(a-b)-(b^3)/[a(a-b)^2]*(a+b)(a-b)/b(a+b)=b/(

（a/(ab-b^2)-b/(a^2-ab))/(（1+a^2+b^2)/2ab)=（a/(b*(a-b))-b/(a*(a-b)))/(（1+a^2+b^2)/2ab)=（(a^2-b^2)/(a*

负三分之一直接去括号你就发现会约掉动下笔算

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

解[(a+b)²/a-[a-(2ab-b²)/a]=(a+b)²/a-[(a²-2ab+b²)/a]=(a²+2ab+b²)/a-

a=-1/9,b=1是求那个式子的值吧(a-2b)(a^2+2ab+4b^2)-a(a+3b)(a-3b)=a³-(2b)³-a(a²-9b²)=a³

[a/(a+b)-b/(b-a)-2ab/(a^2-b^2)]/(1/a-1/b)=[a(a-b)+b(a+b)-2ab]/(a^2-b^2)/[(b-a)/(ab)]=[a^2-ab+ab+b^2-

3a^2+ab-2b^2=0(3a-2b)(a+b)=0可得：3a=2b,则2b=3a,a+b=0,则b=-a,所以a/b-b/a-(a^2+b^2)/ab=a/b-b/a-a/b-b/a=-2b/a

(a+2)²+|b-1|=0则a+2=0,b-1=0则a=-2,b=1-(3a²-4ab)+[a²-2(2a+2ab)]=-3a²+4ab+a²-4a

-ab*(a^2b^5-ab^3-b)=-a^3b^6+a^2b^4+ab^2=-(-2)^3+(-2)^2+(-2)=8+4-2=10

从今年将拿出就个人个人很听话再问：无聊再答：哎刚刚做个任务而已啦。。。原式=[a（9a-6b)+b²]/[a(3a-b)]把a约掉=[9a-6b+（b²/a）]/(3a-b)=a[

（a/ab-b^2-b/a^2-ab)/(1+a^2+b^2/2ab),其中a=-2,b=1=[a/b(a-b)-b/a(a-b)]/[(2ab+a²+b²)/2ab]=[(a&#

（a-2b)(a²+2ab+4b²）-a(a-5b)(a+3b),=a³-8b³-a(a²-2ab-15b²)=a³-8b

(1/ab)(a+b-4/(a+b))ab=15a-b=2(a-b)^2=4(a+b)^2=(a-b)^2+4ab=64a+b=8(ab=15>0,a-b=2>0所以a+b>0)(1/ab)(a+b-

先化简,再求值;［(2a-b/a+b）-（b/a-b)］÷{（a-2b/a+b）+［ab/(a-b)²］},其中b/a=-1/2解,得：［(2a-b)(a-b)-b(a+b)]/[(a+b)

=[(a²+ab+b²)(a-b)][(a²-ab+b²)(a+b)]=(a³-b³)(a³+b³)=a^6-b^6=6

[2a(a²b-ab²)+ab(ab-a²)]÷a²b=[2a²b(a-b)+a²b(b-a)]÷a²b=2(a-b)+b-a=a

原式=（2a-2b+3ab-3b）+(a-b+2a)-(8a-8b+ab-b)=8+9-3b+4+2a-32+3+b=-8+2a-2b=0还可以解出a和b的值带入

4B-A=4(ab-ab²-a²)-(3b²-2a²)=4ab-4ab²-4a²-3b²+2a²=4ab-4ab&sup