Zad. 5 Str. 192 Matematyka z kluczem kl. 5 :) Oblicz: a) 2/15 + 4/5 x 1/3 = ? b) (3 i 2/9 +4 i 5/6) = ?(Trzy całe i dwie dziewiąte, cztery całe i pięć szóstych) c) 2/3 x (7 i 4/20 - 3 i 3/4) =? d) 7 i 4/5 - 1 i 1/5 x 2 i 1/2 = ? PROSZĘ O SZYBKA ODP

a) 2/15 + 4/5 * 1/3= = 2/15 + 4/15= = 6/15= = 3/5 b) (3 i 2/9 + 4 i 5/6) = = 3 i 4/18 + 4 i 15/18= = 7 i 19/18= = 8 i 1/18 c) 2/3 *(7 i 4/20 - 3 i 3/4) = = 2/3 * (7 i 4/20 - 3 i 15/20) = = 2/3 * (6 i 24/20 - 3 i 15/20)= = 2/3 * 3 i 9/20= = 2/3 * 69/20 = = 1/1 * 23/10= = 23/10= = 2 i 3/10 d) 7 i 4/5 - 1 i 1/5 * 2 i 1/2= = 7 i 4/5 - 6/5 * 5/2= = 7 i 4/5 - 3/1 *1/1= = 7 i 4/5 - 3/1= = 7 i 4/5 - 3= = 4 i 4/5

a).2/15 +4/5 · 1/3 = 2/15 +4/15 = 6/15 = 2/5 b).3 i 2/9 +4 i 5/6 = 3 i 4/18 +4 i 15/18 = 7 i 19/18 = 8 i 1/18 c).2/3 · (7 i 4/20 - 3 i 3/4) = 2/3 · (7 i 4/20 - 3 i 15/20) =   = 2/3 · (6 i 24/20 - 3 i 15/20) = 2/3 · 3 i 9/20 = 2/3 · 69/20 = 23/10 = 2 i 3/10 d).7 i 4/5 - 1 i 1/5 · 2 i 1/2 = 7 i 4/5 - 6/5 · 5/2 = 7 i 4/5 - 3 = 4 i 4/5