78x22+22x39+39x53怎么算简便运算
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78×22+22×39+39×53
=39×2×22+22×39+39×53
=39×44+22×39+39×53
=39×(44+22+53)
=39×119
=39×(120-1)
=39×120-39
=4641
78×22+22×39+39×53=4641
=39×2×22+22×39+39×53
=39×44+22×39+39×53
=39×(44+22+53)
=39×119
=39×(120-1)
=39×120-39
=4641
78×22+22×39+39×53=4641
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