考點(diǎn):小數(shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)運(yùn)用加法交換律與結(jié)合律簡算.
(2)運(yùn)用乘法分配律簡算.
(3)運(yùn)用乘法交換律與結(jié)合律簡算.
(4)運(yùn)用減法的性質(zhì)簡算.
(5)先算括號(hào)內(nèi)的,再算括號(hào)外的.
(6)兩個(gè)括號(hào)同時(shí)計(jì)算,再算括號(hào)外的乘法.
解答:
解:(1)16.7+14+86+3.3
=(16.7+3.3)+(14+86)
=20+100
=120
(2)125×7+7×75
=(125+75)×7
=200×7
=1400
(3)4×67×25
=(4×25)×67
=100×67
=6700
(4)62.4-32.8-27.2
=62.4-(32.8+27.2)
=62.4-60
=2.4
(5)340÷(25-5)
=340÷20
=17
(6)(51+29)×(96÷8)
=80×12
=960
點(diǎn)評:此題考查了整數(shù)的四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律簡便計(jì)算.