计算:1232-124×122=______.
题型:填空题难度:一般来源:不详
计算:1232-124×122=______. |
答案
1232-(123+1)×(123-1), =1232-(1232-12), =1232-1232+1, =1. |
举一反三
计算(x-3y)(x+3y)的结果是( )A.x2-3y2 | B.x2-6y2 | C.x2-9y2 | D.2x2-6y2 |
|
499×501可表示为( )A.5002+12 | B.5002-12 | C.5002-4992 | D.5002+4992 |
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填空:x2+______+=______2;______(-2x+3y)=9y2-4x2 |
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