5 x 5 x 5 x ... x 5 x 0 + 1 + 55 = 0 + 56 = 56
5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.0+1+55
=0+1+55
=56
2+2+5+5+6+6+5+5+5+5+5+5555++55+6+6
Tính nhẩm:
| 4 × 1 = ..... | 0 × 1 = ..... | 5 + 1 = ..... |
| 4 : 1 = ..... | 1 × 0 = ..... | 5-1 = ..... |
| 1 × 1 = ..... | 0 : 1 = ..... | 5 × 1 = ..... |
| 1 : 1 = ..... | 0 : 2 = ..... | 5 : 1 = ..... |
a)x÷5=5
b)5+x=9
c)66-x=6×6
d)55-x=5×7
5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+6+5+7+5+8+9+0+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+9+8+9+8+9+9+9+9+9+9+9+9+9+9+9+100+9000+1000=????
Tính nhẩm :
| 5 × 2 = ..... | 5 × 3 = ..... | 5 × 4 = ..... |
| 5 × 9 = ..... | 5 × 8 = ..... | 5 × 7 = ..... |
| 5 × 5 = ..... | 5 × 6 = ..... | 5 × 10 = ..... |
| 5 × 1 = ..... | 1 × 5 = ..... | 4 × 5 = ..... |
5+5+5+5+5+5+5+5+5+5+5+5x0+1
5 + 5 + 5 + 5 + 5 x 0
Bằng bao nhiêu ???
5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5+5?
