运用乘法的运算定律计算下面题目

问题描述:

运用乘法的运算定律计算下面题目
34+34x99=?
35x35+35x64+35=?
173x73-73x73=?
98x37=?
99x49+49=?
125x9-125=?
巧算四道题:
1.125x88+404x25=?
2.320x44+68x440=?
3.79x79-79+22x79=?
4.25x57+25x42+25=?

34+34x99=34x1+34x99=34x(1+99)=34x100=3400
35x35+35x64+35=35x35+35x36+35x1=35x(36+35+1)=35x72=2520
173x73-73x73=73x(173-73)=73x100=7300
98x37=37x(100-2)=3700-74=3626
99x49+49=49x(99+1)=49x100=4900
125x9-125=125x(9-1)=125x8=1000