24×181-3×81×8 36×63+15×37+21能巧算吗
1个回答
2015-11-09
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24×181-3×81×8+36×63+15×37+21x37
=24x(181-81)+36x63+37x(15+21)
=24x100+36x63+37x36
=2400+36x(63+37)
=2400+36x100
=2400+3600
=6000
=24x(181-81)+36x63+37x(15+21)
=24x100+36x63+37x36
=2400+36x(63+37)
=2400+36x100
=2400+3600
=6000
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