考點(diǎn):整數(shù)四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)(3)(6)先算括號(hào)里面的,再算括號(hào)外面的;
(2)先算乘除,后算減法;
(4)直接根據(jù)除法的計(jì)算法則計(jì)算;
(5)根據(jù)除法的性質(zhì)簡(jiǎn)算.
解答:
解:(1)(32+48)×(97-57)
=80×40
=3200
(2)84-80÷16×12
=84-5×12
=84-60
=24
(3)972÷(720-21×33)
=972÷(720-693)
=972÷27
=36
(4)360÷12=30
(5)800÷16
=800÷8÷2
=100÷2
=50
(6)360÷(9×4)
=360÷9÷4
=40÷4
=10
點(diǎn)評(píng):在四則運(yùn)算中,計(jì)算四則混合運(yùn)算時(shí),要按照運(yùn)算順序,先算乘除,后算加減,有括號(hào)的先算括號(hào)里面的,再算括號(hào)外面的.能簡(jiǎn)算的要簡(jiǎn)算.