1.计算 ⑴2a-3(3a-2b)2(a+2b) (2)(x平方-2xy+y平方)-(x平方+2xy+y平方...

题目

1.计算 ⑴2a-3(3a-2b)2(a+2b) (2)(x平方-2xy+y平方)-(x平方+2xy+y平方...
1.计算
⑴2a-3(3a-2b)2(a+2b)
(2)(x平方-2xy+y平方)-(x平方+2xy+y平方）
(3)5a+3[2b-3(a﹣b+2c）﹣（b+c）]
(4)(-4分之3a平方）平方•（4分之3a的3次方）平方

答案

1.2a-3(3a-2b)2(a+2b)=2a-(9a-6b)(2a+4b)=2a-(18a^2-12ab+36ab-24b^2)=2a-18a^2+12ab-36ab+24b^2=2a-18a^2-24ab+24b^2
2.(x^2-2xy+y^2)-(x^2+2xy+y^2)=x^2-2xy+y^2-x^2-2xy-y^2=(-4xy)
3.5a+3[2b-3(a﹣b+2c)-(b+c)]=5a+[6b-9(a-b+2c)-3(b+c)]=5a+6b-9a+9b-18c-3b-3c=12b-4a-21c
4.[(3a^2)/(-4)]^2×[(3a)^3/4]^2=[(81a^5)/(-16)]^2=(6561a^10)/196