Răspuns :
1. a) 2x0=2+2+2+2 (F)
1x3=1+1+1 (A)
2x7=2+2+2+2+2+2+2 (A)
4x2=4+4 (A)
b) 2x4=4x2 (A)
2x5=5x1 (F)
0x2=2x0 (A)
2+2+2=2x3 (A)
2. 2+2+2+2+2+2 = 2x6 sau 6x2
4+4 = 4x2 sau 2x4
8+8 = 2x8 sau 8x2
9+9 = 2x9 sau 9x2.
1x3=1+1+1 (A)
2x7=2+2+2+2+2+2+2 (A)
4x2=4+4 (A)
b) 2x4=4x2 (A)
2x5=5x1 (F)
0x2=2x0 (A)
2+2+2=2x3 (A)
2. 2+2+2+2+2+2 = 2x6 sau 6x2
4+4 = 4x2 sau 2x4
8+8 = 2x8 sau 8x2
9+9 = 2x9 sau 9x2.