列式计算下面各题．（1）23个109相加的和是多少？（2）一个数的28倍是448，这个数是多少？（3）49除2950，商和余数各是多少？
直接写得数．×16= 12÷= 0.3×=÷= 1÷=×÷=×÷×= 0×+=﹣=+=×=÷=
5×= 11×1=÷4= 9×4.5+4.5=÷= 1=×27= 5.6+8×1= 8×4= 12÷6= 3﹣1= 5﹣2+=
直接写出得数×=×=÷3= 16×=+=×÷=×÷×= 1÷3×=÷= 5÷﹣5÷=
直接写得数 14×=×=÷4=×=×7+=×3÷×3=
×÷10÷×14×÷÷÷×3．
×16= 12÷
= 0.3×
=
=
=
×
÷
×
÷
×
+
=
﹣
=
+
=
×
=
÷
=
= 11×1
=
÷4= 9×4.5+4.5=
÷
= 1
=
×27= 5.6+8×1
= 8×4
= 12
÷6= 3
﹣1
= 5﹣2
+
=
×
=
×
=
÷3= 16×
=
+
=
×
÷
=
×
÷
÷
= 5÷
﹣5÷
=
×
=
÷4=
×
=
×7+
×3÷
×
÷10
÷
×14×
÷
÷
÷
×3．
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