考點:整數(shù)四則混合運算,運算定律與簡便運算
專題:運算順序及法則,運算定律及簡算
分析:(1)根據(jù)乘法分配律進(jìn)行簡算;
(2)根據(jù)除法的性質(zhì)進(jìn)行簡算;
(3)根據(jù)加法交換律和結(jié)合律進(jìn)行簡算;
(4)根據(jù)乘法分配律進(jìn)行簡算;
(5)根據(jù)乘法分配律進(jìn)行簡算;
(6)根據(jù)減法的性質(zhì)進(jìn)行簡算;
(7)先算減法,再算乘法,最后算除法;
(8)按照從左向右的順序進(jìn)行計算.
解答:
解:(1)(125+7)×8
=125×8+7×8
=1000+56
=1056;
(2)3700÷25÷4
=3700÷(25×4)
=3700÷100
=37;
(3)3.27+6.3+2.73+4.7
=(3.27+2.73)+(6.3+4.7)
=6+11
=17;
(4)19×25-9×25
=(19-9)×25
=10×25
=250;
(5)25×44
=25×(40+4)
=25×40+25×4
=1000+100
=1100;
(6)7.54-0.68-1.32
=7.54-(0.68+1.32)
=7.54-2
=5.54;
(7)12×(324-285)÷26
=12×39÷26
=468÷26
=18;
(8)9.53-3.75+0.47
=5.78+0.47
=6.25.
點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學(xué)的運算定律簡便計算.