脫式計(jì)算.(能簡(jiǎn)算的要簡(jiǎn)算)
28.76-4.37-5.63
58×0.37+0.37×42
8.27-5.84+1.73-2.16
516÷(36×11-353)
解:(1)28.76-4.37-5.63,
=28.76-(4.37+5.63),
=28.76-10,
=18.76;
(2)58×0.37+0.37×42,
=(58+42)×0.37,
=100×0.37,
=37;
(3)8.27-5.84+1.73-2.16,
=8.27+1.73-(5.84+2.16),
=10-8,
=2;
(4)516÷(36×11-353),
=516÷(396-353),
=516÷43,
=12.
分析:(1)運(yùn)用減法的性質(zhì)簡(jiǎn)算;
(2)運(yùn)用乘法分配律簡(jiǎn)算;
(3)運(yùn)用加法交換律與結(jié)合律以及減法的性質(zhì)簡(jiǎn)算;
(4)先算括號(hào)內(nèi)的乘法,再算括號(hào)內(nèi)的減法,最后算括號(hào)外的除法.
點(diǎn)評(píng):考查了整數(shù)、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)算定律進(jìn)行簡(jiǎn)便計(jì)算.