不思議なかけ算
12345679×18＝222222222
12345679×27＝333333333
12345679×36＝444444444
12345679×45＝555555555
12345679×54＝666666666
12345679×63＝777777777
12345679×72＝888888888
12345679×81＝999999999
987654321× 9＝8888888889
987654321×18＝17777777778
987654321×27＝26666666667
987654321×36＝35555555556
987654321×45＝44444444445
987654321×54＝53333333334
987654321×63＝62222222223
987654321×72＝71111111112
987654321×81＝80000000001
9×9＝ 81
99×99＝9801
999×999＝998001
9999×9999＝99980001
99999×99999＝9999800001
9×9＝81
99×89＝8811
999×889＝888111
9999×8889＝88881111
99999×88889＝8888811111
9の3乗＝729
99の3乗＝970299
999の3乗＝997002999
9999の3乗＝999700029999
99999の3乗＝999970000299999
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