问题
解答题
脱式计算
|
答案
①163+20020÷70-70,
=163+286-70,
=449-70,
=379;
②1.56÷5.2×1.8÷0.12,
=0.3×1.8÷0.12,
=0.54÷0.12,
=4.5;
③10-(
+3 8
)÷1 2
,3 8
=10-
÷7 8
,3 8
=10-
,7 3
=7
;2 3
④6.8÷[(1.55+0.15)×50%],
=6.8÷[1.7×50%],
=6.8÷0.85,
=8.