Question

1\25a^2-1\49(a-b)^2 81m^2-36m+4 x^4-y^2 4(5a-b)^2-9(2a+3b)^2 3(a^2-27)-3/4

(a-b)^2-2(a-b)(a+b)+(a+b)^2
4(3a+2b)^2-9(2a+3b)^2
(a-b)^2-2(a-b)(a+b)+(a+b)^2
帮我一下 谢谢 限制在今天之内给我过程和答案 多谢 悬赏分50
在今天的24:00之前给我答案 大致的过程和答案就行
能做出几个是几个 做出一个的也可以发给我

Answer 1

1/25a²-1/49(a-b)²
=[(1/5a)²-[1/7(a-b)]²
=[1/5a+1/7(a-b)] [1/5a-1/7(a-b)]²
=(1/5a+1/7a-1/7b)(1/5a-1/7a+1/7b)
=(12/35a-1/7b)(2/35a+1/7b)

81m²-36m+4
=(9m)²-2×9m×2+2²
=(9m-2)²

x^4-y²
=(x²)²-y²
=(x²+y)(x²-y)

4(5a-b)²-9(2a+3b)²
=[2(5a-b)]²-[3(2a+3b)]²
=[2(5a-b)+3(2a+3b)] [2(5a-b)-3(2a+3b)]
=(10a-2b+6a+9b)(10a-2b-6a-9b)
=(16a+7b)(4a-11b)

3(a²-27)-3/4
=3/4[4(a²-27)-1]
=3/4(4a²-109)
=3/4[(2a)²-√109²]
=3/4(2a+√109)(2a-√109) 这题，如果题没有出错，只有这样分解了

(a-b)²-2(a-b)(a+b)+(a+b)²
=[(a-b)-(a+b)]²
=(a-b-a-b)²
=(-2b)²
=4b²

4(3a+2b)²-9(2a+3b)²
=[2(3a+2b)]²-[3(2a+3b)]²
=[2(3a+2b)+3(2a+3b)] [2(3a+2b)-3(2a+3b)]
=(6a+4b+6a+9b)(6a+4b-6a-9b)
=(12a+13b)×(-5b)
=-5b(12a+13b)

Answer 2

1/(25a^2)-1/[49(a-b)^2 ]
=[1/(5a)+1/(7b)][1/(5a)-1/(7b)]
=(7b+5a)(7b-5a)/(35ab)

81m^2-36m+4
=(9m)²-2*9*2m+2²
=(9m-2)²

x^4-y^2
=(x²+y)(x²-y)

4(5a-b)^2-9(2a+3b)^2
=[2(5a-b)+3(2a+3b)][2(5a-b)-3(2a+3b)]
=(17a+7b)(4a-11b)

3(a^2-27)-3/4=3(a^2-109/4)
=3(a+√109/2)(a-√109/2) （本题输入不全吧）

(a-b)^2-2(a-b)(a+b)+(a+b)^2
=[(a-b)-(a+b)]²
=(-2b)²
=4b²

4(3a+2b)^2-9(2a+3b)^2
=[2(3a+2b)+3(2a+3b)][2(3a+2b)-3(2a+3b)]
=-5b(12a+13b)