分析:(1)先同時(shí)運(yùn)算除法和乘法,最后算加法;
(2)先算除法,再算乘法,最后算減法;
(3)運(yùn)用加法結(jié)合律簡(jiǎn)算;
(4)先算小括號(hào)里面的減法,再算括號(hào)外的乘法,最后算除法;
(5)先算小括號(hào)里面的乘法,再算中括號(hào)里面的除法,最后算括號(hào)外的除法.
(6)運(yùn)用乘法交換律和結(jié)合律簡(jiǎn)算.
解答:解:(1)350÷7+24×3,
=50+72,
=122;
(2)618-80÷2×5,
=618-40×5,
=618-200,
=418;
(3)243+65+(57+135),
=(243+57)+(65+135),
=300+200,
=500;
(4)15×(41-17)÷30,
=15×24÷30,
=360÷30,
=12;
(5)45÷[210÷(35×2)],
=45÷[210÷70],
=45÷3,
=15;
(6)25×(9×4)×3,
=(25×4)×(9×3),
=100×27,
=2700.
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,以及應(yīng)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算的能力.