一个手机生产厂家6天生产手机510部，照这样计算，生产2380部手机要多少天？
3.57+2.2= 0.9﹣0.26=
=
﹣
=
3.25×4=
= 14÷25=
÷7=
直接写得数．
0.36÷0.3= 2.5×4= 2.9×1000= 1﹣
=
﹣
= 1÷
×
= 1﹣1%= 38﹣19=
直接写得数
0.36+0.4= 0.5÷0.25= 0.23= 4×
÷4×=
+
=（
﹣
）×12=
÷0.18= 4.8﹣1.3﹣2.7=
直接写出得数．
1.36+0.24= 320﹣180= 10﹣2
= 36÷0.4=
﹣
=
+
= 1.2×50=
×5=
9×
=
×
= 0.375×4= 9÷
=
口算
0.1×10= 48÷4.8= 31÷1000= 1.5+0.25﹣
=
9﹣
= 3.838÷38=
= 1﹣
+
=
0.5×1.6=
×4÷
×4=