Question

Afla numarul necunoscut:
a) 236:(7•z-3) = 61
b) x+38-18<83
c) 41+x-39<83-77
d) 32+(2•x-5)=63+14

Answer 1

a)  7z-3 = 236÷61    7z =236/61 + 3= 419/61   z= 419/61÷7 = 419/61×1/7 = =419/427  ( verifica daca ai scris corect ecuatia)

b)  x+20 < 83    x < 63     x∈{0,1,2,3,4,......62}

c)   2+x < 6   x<4   x∈{0,1,2,3}

d)  27+2x= 77   2x= 50  x=25