计算，能简便的要简便算．31.9×18﹣8×31.9 21÷（+）÷ ×14+ 7.8÷[32×（1﹣）+3.6]．
直接写出得数====+=== 1÷===
直接写出得数．×16= 10÷= 12÷=×=×=÷3=×=×=
6×=+=×= 3﹣=÷= 1÷=÷=﹣=×14=÷12=
直接写出得数．== 71.83÷8≈ 5.04×9.85≈=== 0.53=
直接写得数======= 60×60%= 2×32==
+
）÷
7.8÷[32×（1﹣
）+3.6]．
=
=
=
=
+
=
=
= 1÷
=
=
=
×16= 10÷
= 12÷
=
×
=
×
=
÷3=
×
=
×
=
=
+
=
×
= 3﹣
=
÷
=
=
÷
=
﹣
=
×14=
÷12=
=
= 71.83÷8≈ 5.04×9.85≈
=
=
= 0.53=
=
=
=
=
=
=
= 60×60%= 2×32=
=
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