Răspuns:
a) 1 / 8 + 1 / 8 x 4 = 8 / 24
b) 1 / 6 + 1 / 6 : 1 / 3 = 3 / 6
c) 4 / 9 (amplificam cu 10) + 3 / 10 (amplificam cu 9) : 6 / 10
= 40 / 90 + 27 / 90 : 6 / 10
= 67 / 90 : 6 / 10 ⇒ 67 / 90 x 10 / 6
= 670 / 540
d) 1 1/3 x 2 1/2 + 6
= 3 / 3 + 1 / 3 x 8 / 2 + 1 / 2 + 6 / 1 (amplificam cu 2)
= 4 / 3 x 8 / 2 + 12 / 2
= 32 / 6 + 12 / 2 (amplificam cu 3 )
= 44 / 6
e) 2 1 / 7 x 1 1 / 5 - 1 / 21 : 1 / 3
= 8 / 7 + 1 / 7 x 5 / 5 + 1 / 5 - 1 / 21 : 1 / 3
= 9 / 7 x 6 / 5 - 1 / 21 x 3 / 1
= 54 / 35(amplificam cu 21) - 3 / 21(simplificam cu 35 )
=
scz m-am plictisit
pas cu pas:
