分析:(1)運(yùn)用乘法的分配律進(jìn)行簡算;
(2)運(yùn)用乘法的交換律、結(jié)合律進(jìn)行簡算;
(3)運(yùn)用減法的性質(zhì)進(jìn)行簡算;
(4)運(yùn)用乘法的分配律進(jìn)行簡算;
(5)運(yùn)用乘法的分配律進(jìn)行簡算;
(6)運(yùn)用除法的性質(zhì)進(jìn)行簡算;
(7)先算小括號里的運(yùn)算,再算括號外的乘法;
(8)先算除法,再算乘法,最后算加法;
(9)先算小括號里的運(yùn)算,再從左向右進(jìn)行計算.
解答:解:(1)49×102-2×49
=49×(102-2)
=49×100
=4900;
(2)125×76×8
=125×8×76
=1000×76
=76000;
(3)8.33-2.43-4.57
=8.33-(2.43+4.57)
=8.33-7
=1.33;
(4)103×32
=(100+3)×32
=100×32+3×32
=3200+96
=3296;
(5)36×99+36
=36×(99+1)
=36×100
=3600;
(6)41000÷8÷125
=41000÷(8×125)
=41000÷1000,
=41;
(7)(39+21)×(84÷7)
=60×12
=720;
(8)550+230×62÷31
=550+230×(62÷31)
=550+230×2
=550+460
=1010;
(9)(324-285)×12÷26
=39×12÷26
=468÷26
=18.
點(diǎn)評:完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡便方法計算.