(-a-2b)²·(a²-2b)²+(a²b²+2)²-(a²b²-2)²(2a-b)²(4a²+b²)²(2a+b)²3.(2×5+2)(4×7+2)(6×9+2)...(2010×2013+2)___________________________________________(1×4
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/28 04:09:19
![(-a-2b)²·(a²-2b)²+(a²b²+2)²-(a²b²-2)²(2a-b)²(4a²+b²)²(2a+b)²3.(2×5+2)(4×7+2)(6×9+2)...(2010×2013+2)___________________________________________(1×4](/uploads/image/z/244524-12-4.jpg?t=%28-a-2b%29%26%23178%3B%C2%B7%EF%BC%88a%26%23178%3B-2b%EF%BC%89%26%23178%3B%EF%BC%8B%EF%BC%88a%26%23178%3Bb%26%23178%3B%EF%BC%8B2%EF%BC%89%26%23178%3B-%EF%BC%88a%26%23178%3Bb%26%23178%3B-2%EF%BC%89%26%23178%3B%EF%BC%882a-b%EF%BC%89%26%23178%3B%EF%BC%884a%26%23178%3B%2Bb%26%23178%3B%EF%BC%89%26%23178%3B%EF%BC%882a%2Bb%EF%BC%89%26%23178%3B3.%282%C3%975%2B2%29%284%C3%977%2B2%29%286%C3%979%2B2%29...%282010%C3%972013%2B2%29___________________________________________%281%C3%974)
(-a-2b)²·(a²-2b)²+(a²b²+2)²-(a²b²-2)²(2a-b)²(4a²+b²)²(2a+b)²3.(2×5+2)(4×7+2)(6×9+2)...(2010×2013+2)___________________________________________(1×4
(-a-2b)²·(a²-2b)²+(a²b²+2)²-(a²b²-2)²
(2a-b)²(4a²+b²)²(2a+b)²
3.(2×5+2)(4×7+2)(6×9+2)...(2010×2013+2)
___________________________________________
(1×4+2)(3×6+2)(5×8+2)...(2009×2012+2)
²为平方,³为立方
(-a-2b)²·(a²-2b)²+(a²b²+2)²-(a²b²-2)²(2a-b)²(4a²+b²)²(2a+b)²3.(2×5+2)(4×7+2)(6×9+2)...(2010×2013+2)___________________________________________(1×4
怀疑第一题你给错了,多个平方,没法化简
(2a-b)²(4a²+b²)²(2a+b)²
=(2a-b)²(4a²+b²)²(2a+b)²
=[(2a-b)²(2a+b)²](4a²+b²)²
=[(2a-b)(2a+b)]²(4a²+b²)²
=[4a²-b²]² (4a²+b²)²
=[(4a²-b²)(4a²+b²)]²
=(16a²²-b²²)
²²表示4次方
3.(2×5+2)(4×7+2)(6×9+2)...(2010×2013+2)
___________________________________________
(1×4+2)(3×6+2)(5×8+2)...(2009×2012+2)
=12/6x30/20x56/42……
=2/1x3/2x4/3x……
2 3 4 5 6 7……
=——————————
1 2 3 4 5 6……
观察
分母2010-2+1=2009个数
分子2009-1+1=2009个数
按错位约分
分子第一个数和分母第二个数约
分母第二个数和分母第三个数约
……
最后
分子剩最后一个一个2010
分母剩第一个1
结果=2010