题目内容
简便计算.
(1)37.9×94+37.9×7-37.9.
(2)8888×1111+4444×7778.
(1)37.9×94+37.9×7-37.9.
(2)8888×1111+4444×7778.
分析:(1)37.9可看作是37.9×1,可运用乘法分配律进行简便运算.
(2)可把8888拆成4444×2,再运用乘法分配律进行简便运算.
(2)可把8888拆成4444×2,再运用乘法分配律进行简便运算.
解答:解:(1)37.9×94+37.9×7-37.9,
=37.9×94+37.9×7-37.9×1,
=37.9×(94+7-1),
=37.9×100,
=3790;
(2)8888×1111+4444×7778,
=4444×2×1111+4444×7778,
=4444×(1111×2+7778),
=4444×10000,
=44440000.
=37.9×94+37.9×7-37.9×1,
=37.9×(94+7-1),
=37.9×100,
=3790;
(2)8888×1111+4444×7778,
=4444×2×1111+4444×7778,
=4444×(1111×2+7778),
=4444×10000,
=44440000.
点评:解答此类型的题目时要注意观察算式的特点,灵活地运用一些定律进行巧算.
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