3 zadania na 6 DUŻO PUNKTÓW interesuje mnie 2 klasa muszą być obliczenia dokładne

Zad1 1.9 × 8 + 15 = 87 2.8 × 7 + 15 = 71 3.7 × 1 + 15 = 22 4.2 × 2 + 15 = 19 5.1 × 9 + 15 = 26 6.2 × 6 + 15 = 27 7.2 × 7 + 15 = 29 8.2 × 9 + 15 = 33 9.3 × 3 + 15 = 24 10.2 × 4 + 15 = 23 11.2 × 3 + 15 = 21 12.2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 20.2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 30.2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 40.1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 50.2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 2 × 1 + 15 = 18 1 × 8 + 15 = 23 2 × 3 + 15 = 21 60.2 × 1 + 15 = 18 <---- wynik =P Zad2 Miedz - 13x Cyna - 8x %miedzi - 13/21 × 100% = 62% %cyny - 100% - 62% = 38% 13x(miedz) - 8x(cyna) = 5x = 2.5kg x = 0.5kg miedz - 13 × 0.5kg = 6.5kg cyna - 8 × 0.5kg = 4kg Zad3 nie za bardzo wiem jak ruszyc... =/