脱式计算与简便运算=
=
=
=
6﹣×
﹣
= 〔1﹣(
﹣
)〕÷
=
=
=
5+3.6×2.5÷0.48= =
=
=
3.6×2÷16.9÷(3
×1.1 6)×1.3=
+
+
+…+
= .