Odpowiedź:
a)(3 1/2+1 1/2)×3/5=5×3/5=3
b)(2 2/3-4/5)×1 3/7=(2 10/15-12/15)×10/7=1 13/15×10/7=28/15×10/7=8/3=2 2/3
c)(15 2/3-7 1/2):1 1/2=(15 4/6-7 3/6)×2/3=8 1/6×3/2=49/6×3/2=49/4= 12 1/4
e)=9/2×4/3-12/5×5/7=6-12/7=6-1 5/7=4 2/7
Szczegółowe wyjaśnienie:
a) (3 1/2 + 1 1/2) × 3/5 = 5 ×3/5 = 3
b) (2 2/3 - 4/5) × 1 3/7 = (2 10/15 - 12/15) × 10/7 = 1 13/15 × 10/7 = 28/15 × 10/7 = 8/3 = 2 2/3
c) (15 2/3 - 7 1/2) : 1 1/2 = (15 4/6 - 7 3/6) × 2/3 = 8 1/6 × 3/2 = 49/6 × 3/2 = 49/4 = 12 1/4
e) 9/2 × 4/3 - 12/5 × 5/7 = 6 - 12/7 = 6 - 1 5/7 = 4 2/7
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Odpowiedź:
a)(3 1/2+1 1/2)×3/5=5×3/5=3
b)(2 2/3-4/5)×1 3/7=(2 10/15-12/15)×10/7=1 13/15×10/7=28/15×10/7=8/3=2 2/3
c)(15 2/3-7 1/2):1 1/2=(15 4/6-7 3/6)×2/3=8 1/6×3/2=49/6×3/2=49/4= 12 1/4
e)=9/2×4/3-12/5×5/7=6-12/7=6-1 5/7=4 2/7
Szczegółowe wyjaśnienie:
Odpowiedź:
a) (3 1/2 + 1 1/2) × 3/5 = 5 ×3/5 = 3
b) (2 2/3 - 4/5) × 1 3/7 = (2 10/15 - 12/15) × 10/7 = 1 13/15 × 10/7 = 28/15 × 10/7 = 8/3 = 2 2/3
c) (15 2/3 - 7 1/2) : 1 1/2 = (15 4/6 - 7 3/6) × 2/3 = 8 1/6 × 3/2 = 49/6 × 3/2 = 49/4 = 12 1/4
e) 9/2 × 4/3 - 12/5 × 5/7 = 6 - 12/7 = 6 - 1 5/7 = 4 2/7