分析:(1)先算小括号内的,再算中括号内的,最后算括号外的;
(2)把4
化为小数4.5,,计算出0.005×700=3.5,把除法变为乘法,原式变为(4.5-3.5)×
,计算即可;
(3)把分数化为小数,运用乘法分配律简算;
(4)把25%化为分数
,计算即可;
(5)运用加法交换律与结合律简算;
(6)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)
÷[3-(2
-
)],
=
÷[3-
],
=
÷
,
=
×
,
=
;
(2)(4
-0.005×700)÷1
,
=(4.5-3.5)×
,
=1×
,
=
;
(3)1
×1.25+1
×2.2-1
,
=1.8×1.25+1.25×2.2-1.25,
=(1.8+2.2-1)×1.25,
=(4-1)×1.25,
=3×1.25,
=3.75;
(4)32×25%×1
,
=32×
×
,
=10;
(5)38
-15.38+61.25-4.62,
=38.75+61.25-(15.38+4.62),
=100-20,
=80;
(6)7.8÷[32×(2-1
)+3.6],
=7.8÷[32×
+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.
点评:考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.