口算：
2.8÷4×2.5= 1.6+4= 1+0.22= 2﹣
+
=
﹣= 72%÷0.01=
﹣×
=÷
÷
=
0.5×
÷×0.5=
﹣×
﹣=．
直接写出得数．
5.7+11.8+4.3= 2
﹣
+
=（
+
）×24= 0.32﹣0.22=
33×98+66= 10.1×99﹣9.9= 4
﹣（+0.5）= ：
=
8×12.5%=
=
直接写出得数.
0.68+0.32= 32×12.5%=
+
= 40÷50×100%=÷÷
=（
÷
）÷
=
+
÷+=（
+
）×24=
直接写得数．
8.0﹣2.57= 57+23= 25×4%= 3
= 1÷
=
12×（
）= 9.8÷0.7=
×9÷×9=
×0= 1.5+0.1=
直接写出得数
=
=
=
=
8.8×1.25=
=
=
=