9×9-1 = 80
98×9-2 = 880
987×9-3 = 8880
则: 9876 × 9 - 4=
× -=888880
1÷37= 4÷37= 2÷37= 5÷37= 3÷37= 6÷37=
6×4=24 6.6×3.4=22.44 6.66×33.4=222.444
6.666×333.4=
6×4=24 6.6×3.4=22.44 6.66×33.4=222.444
6.666×333.4=
6.6666×3333.4=
99×0.77=76.23
999×0.777=776.223
9999×0.7777=7776.2223
那么:999999×0.777777=
1.23×9+0.04=11.11
12.34×9+0.05=111.11
123.45×9+0.06=1111.11
=×9
=×9+
6.6×6.9=45.54
6.66×66.9=445.554
6.666×666.9=
6.6666×6666.9=
6.66666×66666.9=
0.01+0.02=0.03
0.04+0.05+0.06=0.07+0.08
0.09+0.10+0.11+0.12=0.13+0.14+0.15
0.16+0.17+0.18+0.19+0.20=0.21+
0.22+0.23+0.24
……
如果按照上面的规律写下去,那么第 44 个算式的最后一个数是多少?
我们知道:
(100+98)×(100-98)=1002-982。
(x+y)×(x-y)=( )
(10-1)÷0.9=
(200-2)÷0.9=
(3000-3)÷0.9=
(40000-4)÷0.9=
(500000-5)÷0.9=
(6000000-6)÷0.9=
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 + + + + +