口算
1
﹣
+0.8= 7.4﹣（1
+
）= 1
﹣
﹣
= 1.25×7×8= 12
÷3=
0.25×0.4= 4.4﹣3= 4÷0.25= 3÷10%= 11
×6=
+1÷2
= 
×（1﹣
）= 2×0.75= 
÷
= 5÷25÷0.4=
0.8×
×5= ÷×
= （0.18+
）÷9= 
×
÷
×
= ×÷
=
口算
1﹣+0.8= 7.4﹣（1+）= 1﹣﹣= 1.25×7×8= 12÷3=
0.25×0.4= 4.4﹣3= 4÷0.25= 3÷10%= 11×6=+1÷2= ×（1﹣）= 2×0.75= ÷= 5÷25÷0.4=
0.8××5= ÷×= （0.18+）÷9= ×÷×= ×÷=
+
= ．
+45.6×
﹣ 
+
）× ．
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