直接写出得数．
734﹣199=
+
= 0.6×0.5= 1÷0.5=
4÷9×
= 0.25×4÷
=（
+
）×30= 9.9÷1
=
715÷80≈ 498+3007≈ 46×101≈ 356÷61≈
直接写出得数，有“≈”的是估算题．
487﹣198=
﹣
= 0.6×0.25= 1.6㎡﹣30d㎡=
4.8÷0.01=
÷5=
×
= 3508÷69≈
直接写出得数．
355+445= 1.69﹣0.31= 29×0.02= 52﹣32= 0.75+
×0=
+
= 2﹣
= 3.5×
=
÷4= 0.5×（2.8﹣2.4）=
直接写出下面各题得数．
418+205= 24×5= 7.5+4.9= 16.8÷0.4= 0.1÷10=
÷
=
﹣×0=（
+
）×
= 1.25×0.3×0.8= 4﹣1÷4﹣
．
直接写出结果
568﹣198= 0.65÷1.3= 4.5×102= 5﹣0.25+0.75= 3.7×99+3.7=
0.4÷40%= 600÷25÷8= 1.2
=
= 5﹣5÷6=
30%+6.5= 5÷21×7=
=
=
=
=