问题
解答题
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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.