看谁算得又对又快．420÷30= 750÷15= 810÷90=880÷22= 900÷30= 820÷20=400÷50= 300÷75= 540÷60=
列式计算．①与的差加上与差，结果是多少？②18除以一个数商，再减去3.2等于1.7．求这个数．
= = == = == =
直接写出得数．= = 1﹣= +0.625== = 3﹣= +0.75=
口算：+= 1.52= ﹣= 1.8÷2.7=﹣= += 4+= 3﹣=﹣= ﹣= ﹣﹣= ++=
（1）+= （2）﹣= ．
与
的差加上
与
差，结果是多少？
= 
= 
=
= 
= 
=
= 
=
= 
= 1﹣
= 
+0.625=
= 
= 3﹣
= 
+0.75=
+
﹣
= 1.8÷2.7=
﹣
= 
+
= 4+
= 3﹣
=
﹣
= 
﹣
= 
﹣
﹣
= 
+
+
=
+
= 
﹣
= ．
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