(1)(-2x²y³)².(xy) · (xy)³ (2)(2a+3b)(2a-b)(3)5x²(x+1)(x-1)(4)(2x+y-1)²(5)59.8×60.2(6)198²(7)(2a)³·b四(8) (-2/3 a七b五)÷3/2a²b五(9)(6/5 a³x四-0.9ax³)÷3/5ax³(10)(7x²y³-8x³y²z)÷8x²y²(11)12⒀÷(3⑽ · 4⑾)(12)(因式分解题)1.25x²-16y²2.(a-b)(x-y)-(b-a)(x+y)3.a²-4ab+4b²4.4+12(x-y)+9(x-y)²希望有过程的,如果觉得麻烦也可以写简短过程或不写.如果打不出来的如13次方我会用⒀以及其他符号表示

问题描述:

(1)(-2x²y³)².(xy) · (xy)³
(2)(2a+3b)(2a-b)
(3)5x²(x+1)(x-1)
(4)(2x+y-1)²
(5)59.8×60.2
(6)198²
(7)(2a)³·b四
(8) (-2/3 a七b五)÷3/2a²b五
(9)(6/5 a³x四-0.9ax³)÷3/5ax³
(10)(7x²y³-8x³y²z)÷8x²y²
(11)12⒀÷(3⑽ · 4⑾)
(12)(因式分解题)
1.25x²-16y²
2.(a-b)(x-y)-(b-a)(x+y)
3.a²-4ab+4b²
4.4+12(x-y)+9(x-y)²
希望有过程的,如果觉得麻烦也可以写简短过程或不写.
如果打不出来的如13次方我会用⒀以及其他符号表示

.

(1)(-2x²y³)².(xy) • (xy)³ =4x^8 y^10
(2)(2a+3b)(2a-b)=4a²-2ab+6ab-3b²=4a²+4ab-3b²
(3)5x²(x+1)(x-1)=5x²(x²-1)=5x^4 -5x²
(4)(2x+y-1)² =(2x+y) ²-2(2x+y)+1= 4x²+4xy+y²-4x-2y+1
(5)59.8×60.2=(60-0.2)*(60+0.2)=60²-0.2²=3600-0.04= 3599.96
(6)198²=(200-2) ²=200²-2*2*200+2²=40000-800+4=39204
(7)(2a) ²•b^4=4a² b^4
(8) (-2/3 a^7b^5)÷3/2a² b^5= (-2* a^7 b^5* 2a² b^5)/ (3*3) -----a七b五 不为分母吧
= -4/9( a^9 b^10)
=(-2 * 2a² b^5)/ (3 a^7 b^5*3) = -4/(9 a^5) ------- a七b五 为分母
(9)(6/5 a³ x^4-0.9ax³)÷3/5ax³=2a²x - 1.5
(10)(7x²y³ -8x³ y²z)÷8x²y²=(7/8) y - xz
(11)12^13÷(3^10•4^11)=(3*4)^13÷(3^10•4^11)=3³•4²=27•16=432
(12)(因式分解题)
1. 25x²-16y²=(5x) ²- (4y) ²= (5x-4y)(5x+4y) -----平方差
2.(a-b)(x-y)-(b-a)(x+y)=(a-b)[(x-y)+(x+y)]=2x(a-b)
3.a²-4ab+4b²=a²- 2•a•2b+(2b) ²=(a-2b) ²
4. 4+12(x-y)+9(x-y)²=2² + 2*2*3(x-y) +9(x-y)²=[2+3(x-y)]²=(3x-3y+2) ²

(1)(-2x²y³)².(xy) • (xy)³ =4x^8 y^10
(2)(2a+3b)(2a-b)=4a²-2ab+6ab-3b²=4a²+4ab-3b²
(3)5x²(x+1)(x-1)=5x²(x²-1)=5x^4 -5x²
(4)(2x+y-1)² =(2x+y) ²-2(2x+y)+1= 4x²+4xy+y²-4x-2y+1
(5)59.8×60.2=(60-0.2)*(60+0.2)=60²-0.2²=3600-0.04= 3599.96
(6)198²=(200-2) ²=200²-2*2*200+2²=40000-800+4=39204
(7)(2a) ²•b^4=4a² b^4
(8) (-2/3 a^7b^5)÷3/2a² b^5= (-2* a^7 b^5* 2a² b^5)/ (3*3) -----a七b五 不为分母吧
= -4/9( a^9 b^10)
=(-2 * 2a² b^5)/ (3 a^7 b^5*3) = -4/(9 a^5) ------- a七b五 为分母
(9)(6/5 a³ x^4-0.9ax³)÷3/5ax³=2a²x - 1.5
(10)(7x²y³ -8x³ y²z)÷8x²y²=(7/8) y - xz
(11)12^13÷(3^10•4^11)=(3*4)^13÷(3^10•4^11)=3³•4²=27•16=432
(12)(因式分解题)
1. 25x²-16y²=(5x) ²- (4y) ²= (5x-4y)(5x+4y) -----平方差
2.(a-b)(x-y)-(b-a)(x+y)=(a-b)[(x-y)+(x+y)]=2x(a-b)
3.a²-4ab+4b²=a²- 2•a•2b+(2b) ²=(a-2b) ²
4. 4+12(x-y)+9(x-y)²=2² + 2*2*3(x-y) +9(x-y)²=[2+3(x-y)]²=(3x-3y+2) ²
希望你采纳