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头相同,尾互补(尾相加等于10 24*27=(23+1)*27 2+1=3 2×3=6 3×7=21 24×27=23*27+27=621+27=648
下一个25*27要怎么算出来呢,
人气:120 ℃ 时间:2020-03-27 16:35:20
解答
25x27
=25x(25+2)
=25x25+25x2 {2+1=3 2x3=6 5x5=25}
=625+50
=675
或:
25x27
=(23+2)x27
=23x27+2x27 {2+1=3 2x3=6 3x7=21}
=621+54
=675
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