直接写得数．
13×3= 0÷120= 125×8= 420﹣25﹣75= 90÷90= 280﹣6=
40×50= 2×48×0= 50×4= 180万+12万= 1亿﹣1千万= 8×7÷8×7=
直接写得数．
13×3= 0÷120= 125×8= 420﹣25﹣75= 90÷90= 280﹣6=
40×50= 2×48×0= 50×4= 180万+12万= 1亿﹣1千万= 8×7÷8×7=
÷1
= 21
÷7=
÷7×
= 75÷10%= 0.9+99×0.9=
．
÷
=
+
=
÷
=
×
=
÷1=
÷3=
﹣
=
÷
=
×3= 6×
=
+
×7=
÷1=
÷7=
=
÷21= 2.4×
= 42÷
=
×
=
= 3π= 1﹣
+
=
×
÷
×
=
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