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12x3434一34x1212简算

原题 = 12x3434- 34x1212 简算 = 12×34×(101 - 101) = 0

1012×3434—1212×34 =1012x(3400+34)-(1012+200)x34 =1012x3400+1012x34-1012x34-200x34 =1012x3400-200x34 =(101200-200)x34 =10100x34 =343400 另一种方法 1012×3434—1212×34 =1012x34x101-12x101x34 =(1000+12)x34x101-12x101x34 =1000×34x101...

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