計(jì)算下面各題,怎樣簡(jiǎn)便就怎樣算.
432÷36+12×2
3000÷25÷4
8.46-2.25-3.75
72×125
135×67-67×35
812÷(532-36×14)
解:
(1)432÷36+12×2,
=12+24,
=36;
(2)3000÷25÷4,
=3000÷(25×4),
=3000÷100,
=30;
(3)8.46-2.25-3.75,
=8.46-(2.25+3.75),
=8.46-6,
=2.46;
(4)72×125,
=(8×9)×125,
=8×125×9,
=1000×9,
=9000;
(5)135×67-67×35,
=(135-35)×67,
=100×67,
=6700;
(6)812÷(532-36×14),
=812÷(532-504),
=812÷28,
=29.
分析:(1)先算除法和乘法,再算加法;
(2)根據(jù)除法的性質(zhì)進(jìn)行簡(jiǎn)算;
(3)根據(jù)減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(4)72=8×9,再根據(jù)乘法交換律進(jìn)行簡(jiǎn)算;
(5)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(6)先算乘法,再算減法,最后算除法.
點(diǎn)評(píng):此題主要考查整數(shù)的四則混合運(yùn)算的運(yùn)算順序和應(yīng)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.