问题
解答题
下面各题怎样算简便就怎样算.
|
答案
(1)270÷45
=270÷9÷5
=30÷5
=6;
(2)402+399
=400+2+400-1
=800+1
=801;
(3)37×46+54×37
=(46+54)×37
=100×37
=3700;
(4)25×36
=25×4×9
=100×9
=900.
下面各题怎样算简便就怎样算.
|
(1)270÷45
=270÷9÷5
=30÷5
=6;
(2)402+399
=400+2+400-1
=800+1
=801;
(3)37×46+54×37
=(46+54)×37
=100×37
=3700;
(4)25×36
=25×4×9
=100×9
=900.