考點(diǎn):整數(shù)四則混合運(yùn)算
專(zhuān)題:運(yùn)算順序及法則
分析:(1)先算括號(hào)里面的減法,再算括號(hào)外面的除法和加法;
(2)按從左到右的順序計(jì)算;
(3)(4)(5)先算小括號(hào)里面的,再算中括號(hào)里面的,最后算中括號(hào)外面的.
(6)先算除法,再算乘法,最后算減法.據(jù)此解答即可.
解答:
解:(1)120+480÷(83-23)
=120+480÷60
=120+8
=128
(2)360÷6×51
=60×51
=3060
(3)640÷[(96-80)×4]
=640÷[16×4]
=640÷64
=10
(4)828÷[4×(81-76)+3]
=828÷[4×5+3]
=828÷23
=36
(5)526×[(439+161)÷30]
=526×[600÷30]
=526×20
=10520
(6)355-240÷40×5
=355-6×5
=355-30
=325
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.