考点:整数四则混合运算
专题:运算顺序及法则
分析:(1)先算括号里面的减法,再算括号外面的除法和加法;
(2)按从左到右的顺序计算;
(3)(4)(5)先算小括号里面的,再算中括号里面的,最后算中括号外面的.
(6)先算除法,再算乘法,最后算减法.据此解答即可.
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
点评:在四则运算中,计算四则混合运算时,要按照运算顺序,先算乘除,后算加减,有括号的先算括号里面的,再算括号外面的.能简算的要简算.