55×99=5445
555×999=554445
55555×99999=
8547×26=222222
8547×39=333333
8547×=444444
8547X=
55×99=5445
555×999=554445
×=
(100﹣12)÷8=11
(1000﹣112)÷8=111
(10000﹣1112)÷8=
3737×12=,37037×=555555 37037×=99999
99×99=9801
999×999=998001
9999×9999=
99999×99999=
(100-12)÷8=11
(1000-112)÷8=111
(100000-11112)÷8=
(10000000-1111112)÷8=
1×3+1=22
2×4+1=32
3×5+1=42
……
×+1=20222
n×(n+2)+1=2(n为自然数)
①1.25×(30.1﹣24.91÷4.7)
②[ ﹣( ﹣ )]÷
③15.6×13.1﹣15.6﹣15.6×2.1
④2 ×23.4+11.1×57.6+6.54×28
⑤1234+2341+3412+4123
⑥ + + + + +