72Ⅹ72十63╳32的简便运算?
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72Ⅹ72十63╳32可以这样简便运算:72Ⅹ72十63╳32=72Ⅹ72十72╳28=72╳(72+28)=72╳100=7200
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简便运算过程如下:
方法一:
72×72+63×32
=72×(70+2)+63×(30+2)
=72×70+72×2+63×30+63×2
=5040+(72+63)×2+1890
=6930+135×2
=7200
方法二:
72×72+63×32
=72×8×9+63×8×4
=8×(72×9+63×4)
=8×[72×9+(7×9)×4]
=8×9×(18×4+7×4)
=8×9×4×(18+7)
=288×(20+5)
=288×20+288×5
=5760+1440
=7200
方法三:
72×72+63×32
=72×72+7×9×4×8
=72×72+(8×9)×(4×7)
=72×72+72×28
=72×(72+28)
=72×100
=7200
方法一:
72×72+63×32
=72×(70+2)+63×(30+2)
=72×70+72×2+63×30+63×2
=5040+(72+63)×2+1890
=6930+135×2
=7200
方法二:
72×72+63×32
=72×8×9+63×8×4
=8×(72×9+63×4)
=8×[72×9+(7×9)×4]
=8×9×(18×4+7×4)
=8×9×4×(18+7)
=288×(20+5)
=288×20+288×5
=5760+1440
=7200
方法三:
72×72+63×32
=72×72+7×9×4×8
=72×72+(8×9)×(4×7)
=72×72+72×28
=72×(72+28)
=72×100
=7200
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原式=(8x72+7x32)x9=
8x9(72+7x4)=8x9x4(18+7)
=8x9x4x25=72x100=7200
8x9(72+7x4)=8x9x4(18+7)
=8x9x4x25=72x100=7200
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