列式计算。15与的的和再除以是多少？
直接写出得数．+=﹣+=+=﹣=+=+=++=﹣=+= 3﹣﹣=
直接写出得数﹣=﹣=﹣=+=+=﹣=+=﹣=
直接写出得数．+=﹣=+=﹣= 10﹣﹣=====．
直接写得数===== 1﹣= 1﹣==
直接写出得数.+= 1﹣=﹣= 2.5×3.8×4=+= 10﹣9.12=+0.25= 0.65×9+0.65=
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的和再除以
是多少？
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= 2.5×3.8×4=
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= 10﹣9.12=
+0.25= 0.65×9+0.65=
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