列式计算（1）比457多87的数是多少？（2）754比一个数多115，这个数是多少？（3）360减去一个数得505，减去的数是多少？（4）9个1005是多少？
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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）﹣= ．
直接写出得数．========
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+0.625=
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= 4+
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