跪求数学堂堂练六年级下p27-p28答案
1个回答
±5x2
±2分之3 x2y3
±13m±13n
±9a的n+1次方
(a+b)(a-b)
(m+n)(m-n)
(m+6)(m-6)
(t+ 5分之4)(t- 5分之4)
(m+2)(m-2)
(y+ 7分之1)(t+ 7分之1)
(ab+5)(ab-5)
(xy+0.2)(xy-0.2)
(2分之5 a + 3分之4 b)(2分之5 a - 3分之4 b)
(0.3y+0.1x)(0.3y-0.1x)
2(1+2x)(1-2x)
3(x+3y)(x-3y)
5a(a+2)(a-2)
7x(2y+x)(2y-x)
2ab(3a+5b)(3a-5b)
2m2 (7n+2m)(7n-2m)
9999
24.99
160
0.4
300
(2x-3y)(2x+3y+a)
(9x+9y+11m+11n)(9x+9y-11m-11n)
(x2 +9分之1 y2)(x+3分之1 y)(x-3分之1 y)
（x2 +y2 +xy)（x2 +y2 -xy)
-(5m+n)(m+3n)
设这两个连续奇数为2x-1和2x+1 [(2x-1)+(2x+1)][(2x-1)-(2x+1)]=8x 证明成立
①=3分之2 ②=8分之5 ③=20分之11
