下面的横线上可以填哪些数字？（用“四舍五入”法）（1）7 ×39≈2800 （2）3 ×51≈2000．
直接写得数．×15=÷3=÷= 6×= 72÷=÷3= 2×=××10=
20×=÷=
24×= 15÷=×=÷= 1÷25%=+= 3×÷3×50%=（1﹣1%）÷99%=
直接写得数×8× 81÷÷ 63÷×× 3×÷3× 36×25%
直接写得数．==== 8×3.14== 1÷75%==
×15=
÷3=
÷
= 6×
=
=
÷3= 2
×
=
×
×10=
=
÷
=
= 15÷
=
×
=
÷
=
+
÷3×50%=（1﹣1%）÷99%=
×8
×
81÷
÷
×
×
3×
÷3×
=
=
=
=
= 1÷75%=
=
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