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)減法的性質(zhì)簡算;
(2)根據(jù)乘法結(jié)合律簡算;
(3)根據(jù)加法交換律簡算;
(4)先把102分解成100+2,再運用乘法分配律簡算;
(5)運用乘法分配律簡算;
(6)先把240分解成4×60,再運用乘法結(jié)合律簡算;
(7)根據(jù)除法的性質(zhì)簡算;
(8)根據(jù)減法的性質(zhì)簡算;
(9)先把16分解成8×2,再根據(jù)乘法結(jié)合律簡算.
解答:
解:(1)436-266-34
=436-(266+34)
=436-300
=136;
(2)47×125×8
=47×(125×8)
=47×1000
=47000;
(3)471+353-71
=471-71+353
=400+353
=753;
(4)102×99
=(100+2)×99
=100×99+2×99
=9900+198
=10098;
(5)375×101-375
=375×(101-1)
=375×100
=375;
(6)250×240
=250×(4×60)
=250×4×60
=1000×60
=60000;
(7)4000÷125÷4
=4000÷(125×4)
=4000÷500
=8;
(8)645-180-245
=645-245-180
=400-180
=220;
(9)125×16
=125×(8×2)
=125×8×2
=1000×2
=2000.
點評:完成本題要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.