四年级三个班组织合唱队共72人，一班参加了23人，二班参加了28人，三班参加了多少人？
直接写结果：﹣= 1﹣+=÷= 0÷= 0.6×0.6= 4.6+4=
直接写出得数．======== 1.5×0.4= 10÷2.5= 2.4×5= 0.78÷1.3=
（1）3﹣1=（2）0.6÷=（3）75×10%= （4）+×4=（5）48×（﹣）=．
0.875+=== 1.25×0.16×8= 1÷0.5×2==
直接写出得数． 9.56+1.34== 1﹣== 1÷0.25%==== 1= 2.3÷0.3=
﹣
= 1﹣
÷
=
= 0.6×0.6= 4.6+4=
=
=
=
=
=
=
=
=
=（2）0.6÷
=（3）75×10%=
+
×4=（5）48×（
﹣
）=．
=
=
=
=
= 1﹣
=
= 1÷0.25%=
=
=
= 1
= 2.3÷0.3=
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