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6% × 2,5kg = 0,06 × 2,5 = 0,15kg = 15dag
zad.2.
1 3/5 : 1/2 + 2 1/3 × 1 1/5 = 8/5 × 2 + 7/3 ×6/5 = 16/5 + 42/15= 48/15 + 42/15 = 90/15 = 6
33 1/3% × 6 = 100/3% × 6 = 2
zad.3.
x³-2x²-4x+5 = (-1)³ - 2×(-1)² - 4×(-1) +5= -1 -2 +4 + 5 = 6
30% × 6 = 0,3 × 6 = 1,8
Roztwór zawiera 0,15kg soli.
2. 1 3/5 : 1/2 + 2 1/3 * 1 1/5
3 1/5 + 42/15 = 16/5 + 42/15 = 48/15 + 42/15 = 90/15 = 6
33 1/3 % * 6 = 1/3 * 6 = 2
3. (-1)³ - 2 * (-1)² - 4 * (-1) + 5 = -1 - 2 + 4 + 5 = 6
0,3 * 6 = 1,8