神奇的數學金字塔
81+9=90
882+9=891
8883+9=8892
88884+9=88893
888885+9=888894
8888886+9=8888895
88888887+9=88888896
888888888+9=888888897
8888888889+9=8888888898
81-9=72
882-9=873
8883-9=8874
88884-9=88875
888885-9=888876
8888886-9=8888877
88888887-9=88888878
888888888-9=888888879
8888888889-9=8888888880
81÷9=9
882÷9=98
8883÷9=987
88884÷9=9876
888885÷9=98765
8888886÷9=987654
88888887÷9=9876543
888888888÷9=98765432
8888888889÷9=987654321
1×9+2=11
12×9+3=111
123×9+4=1111
1234×9+5=11111
12345×9+6=111111
123456×9+7=1111111
1234567×9+8=11111111
12345678×9+9=111111111
123456789×9+10=1111111111
9×9+7=88
98×9+6=888
987×9+5=8888
9876×9+4=88888
98765×9+3=888888
987654×9+2=8888888
9876543×9+1=88888888
98765432×9+0=888888888
1×8+1=9
12×8+2=98
123×8+3=987
1234×8+4=9876
12345×8+5=98765
123456×8+6=987654
1234567×8+7=9876543
12345678×8+8=98765432
123456789×8+9=987654321
987654321×9=888888888 9
987654321×18=1 777777777 8
987654321×27=2 666666666 7
987654321×36=3 555555555 6
987654321×45=4 444444444 5
987654321×54=5 333333333 4
987654321×63=6 222222222 3
987654321×72=7 111111111 2
987654321×81=8 000000000 1
12345679×9=111111111
12345679×18=222222222
12345679×27=333333333
12345679×36=444444444
12345679×45=555555555
12345679×54=666666666
12345679×63=777777777
12345679×72=888888888
12345679×81=999999999
1×1=1
11×11=121
111×111=12321
1111×1111=1234321
11111×11111=123454321
111111×111111=12345654321
1111111×1111111=1234567654321
11111111×11111111=123456787654321
111111111×111111111=12345678987654321
7×7=49
67×67=4489
667×667=444889
6667×6667=44448889
66667×66667=44444488889
666667×666667=4444444888889
6666667×6666667=44444448888889
4×4=16
34×34=156
334×334=111556
3334×3334=11115556
33334×33334=111115556
9×9=81
99×99=9801
999×999=998001
9999×9999=99980001
99999×99999=9999800001
999999×999999=999998000001
7×9=63
77×99=7623
777×999=776223
7777×9999=77762223
77777×99999=7777622223
777777×999999=777776222223
1×7+3=10
14×7+2=100
142×7+6=1000
1428×7+4=10000
14285×7+5=100000
142857×7+1=1000000
1428571×7+3=10000000
14285714×7+2=100000000
142857142×7+6=1000000000
1428571428×7+4=10000000000
14285714285×7+5=100000000000
142857142857×7+1=1000000000000
