观察例题/发现规律/按要求答题(120*120)-(119*121)=1 (120*120)-(118*122)=4(120*120)- (117*123)=9 (120*120)-(116*124)=16.(1)(120*120)-(112*128)=___?____ (2)(120*120)-(___*___)=___?____最好附加思考过程错了,(2
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![观察例题/发现规律/按要求答题(120*120)-(119*121)=1 (120*120)-(118*122)=4(120*120)- (117*123)=9 (120*120)-(116*124)=16.(1)(120*120)-(112*128)=___?____ (2)(120*120)-(___*___)=___?____最好附加思考过程错了,(2](/uploads/image/z/8493061-13-1.jpg?t=%E8%A7%82%E5%AF%9F%E4%BE%8B%E9%A2%98%2F%E5%8F%91%E7%8E%B0%E8%A7%84%E5%BE%8B%2F%E6%8C%89%E8%A6%81%E6%B1%82%E7%AD%94%E9%A2%98%EF%BC%88120%2A120%EF%BC%89-%EF%BC%88119%2A121%EF%BC%89%3D1+%EF%BC%88120%2A120%EF%BC%89-%EF%BC%88118%2A122%EF%BC%89%3D4%EF%BC%88120%2A120%EF%BC%89-+%28117%2A123%29%3D9+%28120%2A120%29-%28116%2A124%29%3D16.%281%29%28120%2A120%29-%28112%2A128%29%3D___%3F____+%282%29%28120%2A120%29-%28___%2A___%29%3D___%3F____%E6%9C%80%E5%A5%BD%E9%99%84%E5%8A%A0%E6%80%9D%E8%80%83%E8%BF%87%E7%A8%8B%E9%94%99%E4%BA%86%EF%BC%8C%EF%BC%882)
观察例题/发现规律/按要求答题(120*120)-(119*121)=1 (120*120)-(118*122)=4(120*120)- (117*123)=9 (120*120)-(116*124)=16.(1)(120*120)-(112*128)=___?____ (2)(120*120)-(___*___)=___?____最好附加思考过程错了,(2
观察例题/发现规律/按要求答题
(120*120)-(119*121)=1 (120*120)-(118*122)=4
(120*120)- (117*123)=9 (120*120)-(116*124)=16
.
(1)(120*120)-(112*128)=___?____
(2)(120*120)-(___*___)=___?____
最好附加思考过程
错了,(2)的问号应是144
观察例题/发现规律/按要求答题(120*120)-(119*121)=1 (120*120)-(118*122)=4(120*120)- (117*123)=9 (120*120)-(116*124)=16.(1)(120*120)-(112*128)=___?____ (2)(120*120)-(___*___)=___?____最好附加思考过程错了,(2
(120*120)-(112*128)=64
(120*120)-(120-X*120+X)=X的平方
如果问好是144的话,X=12咯
120^2-(120-n)(120+n)=n^2
(120*120)-(119*121)=(120*120)-(120-1)*(120+1)=(120*120)-(120^2-1^2)=1
(120*120)-(118*122)=(120*120)-(120-2)*(120+2)=(120*120)-(120^2-2^2)=4
……
(120*120)-(118*122)=(120*120)-(120-n)*(12...
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(120*120)-(119*121)=(120*120)-(120-1)*(120+1)=(120*120)-(120^2-1^2)=1
(120*120)-(118*122)=(120*120)-(120-2)*(120+2)=(120*120)-(120^2-2^2)=4
……
(120*120)-(118*122)=(120*120)-(120-n)*(120+n)=(120*120)-(120^2-n^2)=?
所以:
(1)(120*120)-(112*128)= )=(120*120)-(120-8)*(120+8)=(120*120)-(120^2-8^2)=64
(2)(120*120))-(120-12)*(120+12)=144
收起
第一个列式等于36,这个问题我们可以列个式来解决,把一百二十用a表示,得出公式,a*a-(a+n)(a-n)=a*a-(a*a-n*n)=n*n,这个公式n是正负数都成立,我是手机发的打不出平方,大家应该能看明白!