分析:①先算小括號里面的除法,再算小括號里面的加法;
②運(yùn)用乘法分配律簡算;
③先算小括號里面的減法,再算括號外的乘法,最后算括號外的除法;
④同時(shí)運(yùn)算乘法和除法,再算加法;
⑤先把44分解成4×11,再運(yùn)用乘法分配律簡算;
⑥運(yùn)用加法結(jié)合律簡算;
⑦運(yùn)用乘法結(jié)合律簡算;
⑧根據(jù)連續(xù)減去兩個(gè)數(shù),等于減去這兩個(gè)數(shù)的和簡算.
解答:解:①400-(1300÷65+35),
=400-(20+35),
=400-55,
=345;
②29+29×29,
=(1+29)×29,
=30×29,
=870;
③15×(41-17)÷30,
=15×24÷30,
=360÷30,
=12;
④19×96+962÷74,
=1824+13,
=1837;
⑤25×44,
=25×(4×11),
=25×4×11,
=100×11,
=1100;
⑥355+260+140+245,
=(355+245)+(260+140),
=600+400,
=1000;
⑦50×25×20×40,
=(50×20)×(25×40),
=1000×1000,
=1000000;
⑧645-180-245,
=645-245-180,
=400-180,
=220.
點(diǎn)評:本題考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡便計(jì)算.