你的簡算學(xué)得怎么樣?檢驗(yàn)一下吧!
59×23+23
(25+125)×8
25×47×4 65×102
2.3+10.9+7.7 54.2-(4.2+17)
分析:(1)(2)(4)根據(jù)乘法分配律簡便計(jì)算;
(3)根據(jù)乘法交換律簡便計(jì)算;
(5)根據(jù)加法交換律簡便計(jì)算;
(6)根據(jù)連減的簡算方法計(jì)算即可.
解答:解:(1)59×23+23
=(59+1)×23
=60×23
=1380;

(2)(25+125)×8
=25×8+125×8
=200+1000
=1200;

(3)25×47×4
=25×4×47
=100×47
=4700;

(4)65×102
=65×(100+2)
=65×100+65×2
=6500+130
=6630;

(5)2.3+10.9+7.7
=2.3+7.7+10.9
=10+10.9
=20.9;

(6)54.2-(4.2+17)
=54.2-4.2-17
=50-17
=33.
點(diǎn)評:考查了運(yùn)算定律與簡便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算律簡便計(jì)算.
練習(xí)冊系列答案
相關(guān)習(xí)題

同步練習(xí)冊答案