直接写得数．42÷7= 81÷9= 2000+4000= 72÷9=40÷8= 54÷6= 6000﹣3000= 64÷8=
========
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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+0.75=
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