一堆煤原计划每天烧4吨，可烧72天，由于改进炉灶，实际每天烧3.2吨，这堆煤可多烧多少天？
直接写出得数：×2=÷=+= 4×（+）= 1÷37.5%= 5÷5÷= 32﹣32×=（ ﹣）×20=
直接写出计算结果．== 8×= 12=== 2﹣= 1=
直接写出得数． 3×=÷0.5= 9÷=÷﹣= （1﹣）÷= 2÷×=
直接写得数．×6= 30×=÷= 20÷=+=××0=×= 1÷×= 5.6÷0.08= 39××=
直接写得数．﹣=÷=×=×= 10×=×=÷=÷= 15×=÷=+=÷22=
×2=
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=
+
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= 8×
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×
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×6= 30×
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= 20÷
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+
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×0=
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= 1÷
=
×
=
﹣
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÷
=
×
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= 10×
=
×
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= 15×
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÷22=
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