X=frunzele
7a)7+7+7+7=X×7
14+14=X×7
28=X×7
X=4
(P:4×7=28)
8+8+8=3×X
16+8=3×X
24=3×X
X=7
(P:3×7=24)
2×6=X+X
12=X+X
X+X={1+11;2+10;...;12+0}
4×X=X+9+X+X
4×9=9+9+9+9
X=9
2+2+2 __ 2×2
6__4
(6>4)
4+4+4___5×4
12___20
(12<20)
4×8____8+8+8+8
24_____24
(32=32)
5×7______7+7+7+7
35_______28
35>28
Sper că te-am ajutat.
