計(jì)算下面各題,能簡(jiǎn)便的用簡(jiǎn)單運(yùn)算
(1)27×86+86×73
(2)201-(960+627)÷23
(3)(250-72)×20
(4)199×49+49
(5)76×125
(6)25×[480-(1196-300)÷16].
解:
(1)27×86+86×73,
=(27+73)×86,
=100×86,
=8600;
(2)201-(960+627)÷23,
=201-1587÷23,
=201-69,
=132;
(3)(250-72)×20,
=178×20,
=3560;
(4)199×49+49,
=(199+1)×49,
=200×49,
=9800;
(5)76×125,
=(80-4)×125,
=80×125-4×125,
=10000-500,
=9500;
(6)25×[480-(1196-300)÷16],
=25×[480-896÷16],
=25×[480-56],
=25×424,
=10600.
分析:(1)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(2)先算加法,再算除法,最后算減法;
(3)先算減法,再算乘法;
(4)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(5)76=80-4,然后再根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(6)先算小括號(hào)里面的減法,再算中括號(hào)里面的除法,再算中括號(hào)里面的減法,最后算乘法.
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.