+ + =(1- )+( - )+( - )
+ + + + =
(10-1)÷0.9=
(200-2)÷0.9=
(3000-3)÷0.9=
(40000-4)÷0.9=
(500000-5)÷0.9=
(6000000-6)÷0.9=
(9999+9997+…+9001)-(1+3+…+999)
①88.2÷9=9.8 ②88.83÷9=9.87 ③88.884÷9=9.876
④88.8885÷9= ⑤88.88886÷9= ⑥88.888887÷9=
1.08÷0.9=1.2
11.07÷0.9=12.3
111.06÷0.9=123.4
1111.05÷0.9=
……
÷0.9=1234567.8
99×0.77=76.23
999×0.777=776.223
9999×0.7777=7776.2223
那么:999999×0.777777=
3.3×6.9=22.77
3.33 ×66.9=222.777
3.333×666.9=
......
88.83÷9=9.87
88.884÷9=9.876
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 + + + + +