考點(diǎn):運(yùn)算定律與簡(jiǎn)便運(yùn)算,小數(shù)四則混合運(yùn)算
專(zhuān)題:運(yùn)算定律及簡(jiǎn)算
分析:①23+43.03+14.77+12.97,運(yùn)用加法結(jié)合律和結(jié)合律簡(jiǎn)算;
②80.43-(5.06+44.43),根據(jù)減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
③78×125×8,運(yùn)用乘法結(jié)合律簡(jiǎn)算;
④134×51+51×66,運(yùn)用乘法分配律簡(jiǎn)算;
⑤25×36,把36拆分為:4×9,運(yùn)用乘法結(jié)合律簡(jiǎn)算;
⑥960×46÷48,根據(jù)乘法交換律進(jìn)行簡(jiǎn)算;
⑦3000÷125÷8.根據(jù)除法的運(yùn)算性質(zhì)簡(jiǎn)算.
解答:
解:①23+43.03+14.77+12.97
=(23+14.77)+(43.03+12.97)
=37.77+56
=93.77;
②80.43-(5.06+44.43)
=80.43-44.43-5.06
=36-5.06
=30.94;
③78×125×8
=78×(125×8)
=78×1000
=78000;
④134×51+51×66
=(134+66)×51
=200×51
=10200;
⑤25×36
=(25×4)×9
=100×9
=900;
⑥960×46÷48
=960÷48×46
=20×46
=920;
⑦3000÷125÷8
=3000÷(125×8)
=3000÷1000
=3.
點(diǎn)評(píng):此題考查的目的是理解掌握加法、乘法的運(yùn)算定律、加、減法的性質(zhì)、乘、除法的運(yùn)算性質(zhì),并且能夠靈活運(yùn)用這些運(yùn)算定律和運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)便計(jì)算.