簡便計(jì)算
5.52-0.55-0.45   
12.59+4.37-2.59    
36.5-36.5×0.95    9.68-4.36+3.32-8.64
2.4×1.02      8.6÷0.25÷4     
12.5×25×3.2       9.28×1.3+92.8×0.87.
分析:①5.52-0.55-0.45,根據(jù)減法的運(yùn)算性質(zhì)a-b-c=a-(b+c)簡算;
②12.59+4.37-2.59,根據(jù)加、減法的運(yùn)算性質(zhì)a+b-c=a-c+b簡算;
③36.5-36.5×0.95,運(yùn)用乘法分配律簡算;
④9.68-4.36+3.32-8.64,根據(jù)加、減法的運(yùn)算性質(zhì)簡算;
⑤2.4×1.02,轉(zhuǎn)化為:2.4×(1+0.02),運(yùn)用乘法分配律簡算;
⑥8.6÷0.25÷4,根據(jù)除法的運(yùn)算性質(zhì)a÷b÷c=a÷(b×c)簡算;
⑦12.5×25×3.2,把3.2拆分為:8×0.4,運(yùn)用乘法交換律和結(jié)合律簡算;
⑧9.28×1.3+92.8×0.87,轉(zhuǎn)化為:92.8×0.13+92.8×0.87運(yùn)用乘法分配律簡算.
解答:解:①5.52-0.55-0.45,
=5.52-(0.55+0.45),
=5.52-1,
=4.52;

②12.59+4.37-2.59,
=12.59-2.59+4.37,
=10+4.37,
=14.37;

③36.5-36.5×0.95,
=36.5×(1-0.95),
=36.5×0.05,
=1.825;

④9.68-4.36+3.32-8.64,
=9.68+3.32-(4.36+8.64),
=13-13,
=0;

⑤2.4×1.02,
=2.4×1+2.4×0.02,
=2.4+0.048,
=2.448;

⑥8.6÷0.25÷4,
=8.6÷(0.25×4),
=8.6÷1,
=8.6;

⑦12.5×25×3.2,
=(12.5×8)×(25×0.4),
=100×10,
=1000;

⑧9.28×1.3+92.8×0.87,
=92.8×(0.13+0.87),
=92.8×1,
=92.8.
點(diǎn)評(píng):此題考查的目的是理解掌握加、減、除法的運(yùn)算性質(zhì)和乘法的運(yùn)算定律,并且能夠靈活運(yùn)用這些運(yùn)算性質(zhì)和運(yùn)算定律進(jìn)行簡便計(jì)算.
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