Question

DETERMINĂ NECUNOSCUTA .A).(4+8:8)×c=30.B). b×7+17=80.

Answer 1

(4 +8:8 )×c = 30
(4 + 1 ) ×c = 30
5 × c=30
c=30:5
c=6
5×6 = 30
b×7 + 17 = 80
b×7 = 80 -17
b×7 = 63
b=63 :7
b=9

Answer 2

a)(4+8:8)×c=30
(4+1)×c=30
5×c=30
c=30:5
c=6

b)b×7+17=80
b×7=80-17
b×7=63
b=63:7
b=9