考點(diǎn):運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算定律及簡(jiǎn)算
分析:(1)把99化成(100-1),再運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(2)運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(3)運(yùn)用乘法交換與結(jié)合律簡(jiǎn)算;
(4)(5)(6)根據(jù)除法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算即可.
解答:
解:(1)26×99
=26×(100-1)
=26×100-26×1
=2600-26
=2574;
(2)9×99+99
=(9+1)×99
=10×99
=990;
(3)15×8×125×20
=(15×20)×(125×8)
=300×1000
=300000;
(4)4600÷92
=4600÷(46×2)
=4600÷46÷2
=100÷2
=50;
(5)4500÷125
=4500÷(5×5×5)
=4500÷5÷5÷5
=900÷5÷5
=180÷5
=36;
(6)7800÷4÷25
=7800÷(4×25)
=7800÷100
=78.
點(diǎn)評(píng):此題考查學(xué)生靈活運(yùn)用運(yùn)算定律簡(jiǎn)算的能力.