79又78/79×77怎么简便计算？
2个回答
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79又78/79×77
=（80-1+78/79）×77
=80×77-1×77+78/79×77
=6160-77+78/79×（79-2）
=6160-77+78/79×79-78/79×2
=6160-77+78-156/79
=6160+（78-7 ）-1又77/79
=6160+1-1又77/79
=6161-1又77/79
=6160又79/79-1又77/79
=6159又2/79
=（80-1+78/79）×77
=80×77-1×77+78/79×77
=6160-77+78/79×（79-2）
=6160-77+78/79×79-78/79×2
=6160-77+78-156/79
=6160+（78-7 ）-1又77/79
=6160+1-1又77/79
=6161-1又77/79
=6160又79/79-1又77/79
=6159又2/79
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展开全部
79又78/79×77
=（80-1+78/79）×77
=80×77-1×77+78/79×77
=6160-77+78/79×（79-2）
=6160-77+78/79×79-78/79×2
=6160-77+78-156/79
=6160+（78-7 ）-1又77/79
=6160+1-1又77/79
=6161-1又77/79
=6160又79/79-1又77/79
=6159又2/79
=（80-1+78/79）×77
=80×77-1×77+78/79×77
=6160-77+78/79×（79-2）
=6160-77+78/79×79-78/79×2
=6160-77+78-156/79
=6160+（78-7 ）-1又77/79
=6160+1-1又77/79
=6161-1又77/79
=6160又79/79-1又77/79
=6159又2/79
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