儿童单轮车每辆的价钱是900元，幼儿园买了4辆，一共用了多少元？
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．
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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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