计算下面各题,能简便的用简单运算
(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)根据乘法分配律进行简算;
(2)先算加法,再算除法,最后算减法;
(3)先算减法,再算乘法;
(4)根据乘法分配律进行简算;
(5)76=80-4,然后再根据乘法分配律进行简算;
(6)先算小括号里面的减法,再算中括号里面的除法,再算中括号里面的减法,最后算乘法.
点评:此题主要考查整数的四则混合运算的运算顺序和应用运算定律进行简便计算.