在18的因数上画▲在30的因数上画○
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18和30的公因数有 ，最大公因数是 ．
直接写出得数．
180÷60= 2﹣
= 1.75+
=
+
=
0÷= 10×10%= 2.5×
=
÷
=
﹣0.4= 1.8×
=
直接写得数．
1÷
= 0.32÷0.8= 2.3+3.57= 7.3﹣2.8=
÷
=
+
= 1÷
×= 2×
+5=
+4﹣+4=
×99+=
口算．
1
÷0.5= 1
﹣1÷1= 1.25×
×8=
×5.6=
÷5××5= 4
×0×4= 120×（
+
）=
+0.29+
=
3
﹣
﹣
=（
﹣
）×20=
直接写结果．
9×
= 3﹣
÷0.75=
+1= 2÷
=
0.9+99×0.9=
×8÷×8= 1﹣
﹣
=
﹣
=
×
×
= 42÷[14﹣（50﹣39）]=
直接写出得数．
24.06+0.4= 180×40= 7﹣3.635= 50%÷2%=
+
=
×12=
÷
= 3﹣
=