36×56+72×73-72用简便运算36×56+72×73-72用简便运算怎么算脱式
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36×56+72×73-72
=36×56+72×73-72×1
=36×56+72×(73-1)
=36×56+72×72
=36×56+36×2×72
=36×(56+2×72)
=36×(56+144)
=36×200
=7200
=36×56+72×73-72×1
=36×56+72×(73-1)
=36×56+72×72
=36×56+36×2×72
=36×(56+2×72)
=36×(56+144)
=36×200
=7200
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