Question

Calculează: c x d- a x b, dacă:a-5 X5 x4= bx10= c:2:2=600: d=10 x2 x5

Answer 1

600:d = 10×2×5
600:d = 100
d = 600:100
d = 6

c:2:2 = 600:6
c:2:2 =100
c:2 = 100×2
c:2 = 200
c = 200×2
c = 400

b×10 = 100
b = 100:10
b = 10

a-5×5×4 = 100
a-100 = 100
a = 100+100
a = 200

c×d - a×b = 400×6 - 200×10 = 2 400-2 000 = 400