25+15=40，2×40=80，1600÷80=20列成综合算式是 ．
直接写出得数×24= ÷= 25××= 5.8×9+5.8=+= 5÷5÷= ÷÷×= 1÷2.5%=
直接写得数．×= ÷= 1﹣=0.13= （+）×8= ﹣=+= ×= 0÷=÷3×÷3=
用递等式计算．．
直接写出得数+= 1÷= ×= ÷9=（﹣0.5）÷= ÷= ×= ÷10=﹣= ÷×=
口算：+= 3﹣2= 1÷1= 7×÷7×=5÷5= ×1.2= ×1= （+）×20=
×24= 
÷
= 25×
×
= 5.8×9+5.8=
+
= 5÷5÷
= 
÷
÷
×
= 1÷2.5%=
×
= 
÷
= 1﹣
=
+
）×8= 
﹣
=
+
= 
×
= 0÷
=
÷3×
．
+
= 1÷
= 
×
= 
÷9=
﹣0.5）÷
= 
÷
= 
×
= 
÷10=
﹣
= 
÷
×
=
+
= 3﹣2
= 1
÷1= 7×
÷5= 
×1.2= 
×1
= （
+
）×20=
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