分析:(1)先算括號(hào)內(nèi)的乘除,再算減法;
(2)利用乘法分配律簡(jiǎn)算;
(3)先算除法,再算乘法,最后算加法;
(4)88=8×11,利用乘法結(jié)合律簡(jiǎn)算;
(5)按照從左到右的順序計(jì)算;
(6)利用減法的性質(zhì)簡(jiǎn)算;
(7)102=100+2,利用乘法分配律簡(jiǎn)算;
(8)32=8×4,利用乘法結(jié)合律簡(jiǎn)算;
(9)530×7.5=53×75,利用乘法分配律簡(jiǎn)算;
(10)利用加法結(jié)合律簡(jiǎn)算;
(11)利用加法交換律與結(jié)合律簡(jiǎn)算;
(12)利用乘法分配律簡(jiǎn)算.
解答:解:(1)2800-(48×15÷24)
=2800-720÷24
=2800-30
=2770;
(2)46×27+27×54
=(46+54)×27
=100×27
=2700;
(3)950+560÷14×28
=950+40×28
=950+1120
=2070;
(4)125×88
=125×8×11
=1000×11
=11000;
(5)113.7+76.88-47.3
=190.58-47.3
=143.28;
(6)17.48-4.57-5.43
=17.48-(4.57+5.43)
=17.48-10
=7.48;
(7)25×102
=25×100+25×2
=2500+50
=2550;
(8)125×32×25
=125×8×(4×25)
=1000×100
=100000;
(9)53×25+530×7.5
=53×25+53×75
=53×(25+75)
=53×100
=5300;
(10)1.375+0.35+2.65
=1.375+(0.35+2.65)
=1.375+3
=4.375;
(11)4.8+5.07+2.2+4.93
=4.8+2.2+(4.93+5.07)
=7+10
=17;
(12)103×99+103
=103×(99+1)
=103×100
=10300.
點(diǎn)評(píng):整數(shù)混合運(yùn)算,關(guān)鍵是搞清運(yùn)算順序,正確按運(yùn)算順序計(jì)算即可,注意數(shù)字特點(diǎn)靈活選用適當(dāng)?shù)姆椒ê?jiǎn)算.