问题 解答题
下面各题,怎样算简便就怎样算.
165+299

47×9+47

630÷18÷5

36×25
63×73-63×63421-175-25125×25×6472×26+36×48.
答案

(1)165+299

=165+300-1

=465-1

=464;

(2)47×9+47

=47×(9+1)

=47×10

=470;

(3)630÷18÷5

=630÷(18×5)

=630÷90

=4;

(4)36×25

=(4×9)×25

=(4×25)×9

=100×9

=900;

(5)63×73-63×63

=63×(73-63)

=63×10

=630;

(6)421-175-25

=421-(175+25)

=421-200

=221;

(7)125×25×64

=125×25×(8×8)

=(125×8)×(25×8)

=1000×200

=200000;

(8)72×26+36×48

=(36×2)×26+36×48

=36×52+36×48

=36×(52+48)

=36×100

=3600.

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