分析:(1)先算除法和乘法,再算加法;
(2)先算除法,再算減法,最后算加法;
(3)先算乘法,再算加法,最后算除法;
(4)先算減法,再算乘法,最后算除法;
(5)先算小括號(hào)里面的除法,再算中括號(hào)里面的除法,最后算括號(hào)外面的除法;
(6)先算加法,再算減法,最后算乘法;
(7)根據(jù)加法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(8)根據(jù)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(9)根據(jù)乘法結(jié)合律進(jìn)行簡(jiǎn)算.
解答:解:
(1)135÷27+12×4,
=5+48,
=53;
(2)1620-1320÷60+80,
=1620-22+80,
=1598+80,
=1678;
(3)(85+14×5)÷5,
=(85+70)÷5,
=155÷5,
=31;
(4)520÷[13×(43-33)],
=520÷[13×10],
=520÷130,
=4;
(5)490÷[210÷(360÷12)],
=490÷[210÷30],
=490÷7,
=70;
(6)[160-(75+38)]×107,
=[160-113]×107,
=47×107,
=5029;
(7)45+61+39+55,
=(45+55)+(61+39),
=100+100,
=200;
(8)25×5×4×2,
=(25×4)×(5×2),
=100×10,
=1000;
(9)125×(8×5)×7,
=(125×8)×(5×7),
=1000×35,
=35000.
點(diǎn)評(píng):此題主要考查整數(shù)的四則混合運(yùn)算的運(yùn)算順序和應(yīng)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.