题目内容
(1)25×24 | (2)450÷5÷9 | (3)201×24 | (4)94×57+57×6. |
分析:(1)先把24分解成4×6,再运用加法结合律简算;
(2)根据除法的性质简算;
(3)先把201分解成200+1,再运用乘法分配律简算;
(4)运用乘法分配律简算.
(2)根据除法的性质简算;
(3)先把201分解成200+1,再运用乘法分配律简算;
(4)运用乘法分配律简算.
解答:解:(1)25×24,
=25×4×6,
=100×6,
=600;
(2)450÷5÷9,
=450÷(5×9),
=450÷45,
=10;
(3)201×24,
=(200+1)×24,
=200×24+1×24,
=4800+24,
=4824;
(4)94×57+57×6,
=(94+6)×57,
=100×57,
=5700.
=25×4×6,
=100×6,
=600;
(2)450÷5÷9,
=450÷(5×9),
=450÷45,
=10;
(3)201×24,
=(200+1)×24,
=200×24+1×24,
=4800+24,
=4824;
(4)94×57+57×6,
=(94+6)×57,
=100×57,
=5700.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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