Question

Găseşte numărul potrivit pentru fiecare egalitate:a)85=9x +4,78=8x +6,58=7x +2,65=9x +2,b) (76- ):8=9,(39- ):7=5,(69+ ):8=9,(88+ ):9=10.

Answer 1

a)85=9×9+4
78=8×9+6
58=7×8+2
65=9×7+2
b)(76-4):8=9
(39-4):7=5
(69+3):8=9
(88+2):9=10

Answer 2

a) 85=9x+4->9x=85-4->9x=81->x=9
    78=8x+6->8x=78-6->8x=72->x=9
    58=7x+2->7x=58-2->7x=56->x=8
    65=9x+2->9x=65-2->9x=63->x=7