考點:運算定律與簡便運算
專題:運算定律及簡算
分析:(1)(3)(6)(7)(8)根據(jù)乘法分配律簡算即可;
(2)首先把32分成8×4,然后根據(jù)乘法交換律和結(jié)合律簡算即可;
(4)首先把4.4分成4+0.4,然后根據(jù)乘法分配律簡算即可;
(5)根據(jù)除法的性質(zhì)簡算即可.
解答:
解:(1)2.37×2.7+2.37×7.3
=2.37×(2.7+7.3)
=2.37×10
=23.7
(2)2.5×1.25×32
=2.5×1.25×8×4
=(2.5×4)×(1.25×8)
=10×10
=100
(3)4.8×101
=4.8×(100+1)
=4.8×100+4.8
=480+4.8
=484.8
(4)4.4×25
=(4+0.4)×25
=4×25+0.4×25
=100+10
=110
(5)2.64÷5÷0.2
=2.64÷(5×0.2)
=2.64÷1
=2.64
(6)3.8×10.1
=3.8×(10+0.1)
=3.8×10+3.8×0.1
=38+0.38
=38.38
(7)14.9×3.3+14.9×7.7
=14.9×(3.3+7.7)
=14.9×11
=14.9×10+14.9
=149+14.9
=163.9
(8)0.23×24+2.3×8.6-23
=0.23×24+0.23×86-0.23×100
=0.23×(24+86-100)
=0.23×10
=2.3
點評:此題主要考查了小數(shù)四則混合運算,注意運算順序,注意乘法運算定律、除法的性質(zhì)的應用.