混合运算（能简便的一定要简便）4.58+3.38+6.62 0.25×0.125×4×84.2×0.75+0.75×5.8 6.38÷0.25÷4．
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？
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=
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=
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=
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= 1﹣
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+0.625=
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= 3﹣
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+0.75=
+
﹣
= 1.8÷2.7=
﹣
=
+
= 4+
= 3﹣
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﹣
=
﹣
=
﹣
﹣
=
+
+
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+
= 
﹣
= ．
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