一个数减去238得195，这个数是多少？
直接写得数．×3=×0×15= 0.6÷= 2﹣﹣= （2+）÷2==（）×5=（）×12=
计算下面各题．．
×÷÷÷×÷÷．
直接写出得数．×=××=÷3= 12×=+﹣+= 20÷= 18÷÷=×= 0×=×÷×=
口算 56×= 2﹣=+= 6×= 0.25×4= 57×=÷= 1÷= 21÷=÷= 1÷= 0÷=
×3=
×0×15= 0.6÷
= 2﹣
﹣
=
）÷2
=（
）×5=（
）×12=
．
×
÷
÷
÷
×
÷
÷
．
×
=
×
×
=
÷3= 12×
=
+
﹣
+
=
= 18÷
÷
=
= 0×
=
×
÷
= 2﹣
=
+
= 6×
= 0.25×4= 57×
=
÷
= 1÷
= 21÷
=
÷
= 1÷
= 0÷
=
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