拖式計算(第1、2、3、要用簡便方法)
①0.6×125+0.4×125     
②101×1.12        
③36-12.5-17.5 9.8÷0.49×0.56          
(8.6-6.9)×5.5          35.7+3.6÷7.2
分析:①運(yùn)用乘法分配律簡算;
②把101看作100+1,運(yùn)用乘法分配律簡算;
③運(yùn)用減法的性質(zhì)簡算;
④先算除法,再算乘法;
⑤先算括號內(nèi)的,再算括號外的;
⑥先算除法,再算加法.
解答:解:①0.6×125+0.4×125,
=(0.6+0.4)×125,
=1×125,
=125;

②101×1.12,
=(100+1)×1.12,
=100×1.12+1.12,
=112+1.12,
=113.12;

③36-12.5-17.5,
=36-(12.5+17.5),
=36-30,
=6;

④9.8÷0.49×0.56,
=20×0.56,
=11.2;

⑤(8.6-6.9)×5.5,
=1.7×5.5,
=9.35;

⑥35.7+3.6÷7.2,
=35.7+0.5,
=36.2.
點(diǎn)評:此題考查了小數(shù)的四則混合運(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)算律簡便計算.
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