口算．
17×8= 88÷8= 80+35= 156﹣（56﹣48）=
280﹣37= 200÷25= 130﹣80= 63÷7×9=
80×90= 400÷40= 120+80÷5= 420﹣420÷60=
口算．
17×8= 88÷8= 80+35= 156﹣（56﹣48）=
280﹣37= 200÷25= 130﹣80= 63÷7×9=
80×90= 400÷40= 120+80÷5= 420﹣420÷60=
=
÷21= 2.4×
= 42÷
=
×
=
= 3π= 1﹣
+
=
×
÷
×
=
÷8= 1÷0.01=
×6=
÷
= 1÷
=
+
=
﹣
=
÷
=
+
=
×
=
=
=
=
=
=
=
=
=
=
﹣
=
×
=
=
+
=
÷
= 14×
= 1÷60%=
÷
=8 ．
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