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giá 15 quyển là:
7000.15=105000(đồng)
10% của 105000 là:
105000.10%=10500(đồng)
số tiền đã giảm là:
105000-10500=94500(đồng)
vậy an đủ tiền mua và thùa 5500 đồng
a)\(1-\dfrac{1}{2}+\dfrac{1}{3}\)
=\(\dfrac{1}{2}+\dfrac{1}{3}\)
=\(\dfrac{5}{6}\)
b)\(\dfrac{2}{5}+\dfrac{3}{5}:\dfrac{9}{10}\)
=\(\dfrac{2}{5}+\dfrac{2}{3}\)
=\(\dfrac{16}{15}\)
c)\(\dfrac{7}{11}.\dfrac{3}{4}+\dfrac{7}{11}.\dfrac{1}{4}+\dfrac{4}{11}\)
=\(\dfrac{7}{11}.\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\dfrac{4}{11}\)
=\(\dfrac{7}{11}.1+\dfrac{4}{11}\)
=\(\dfrac{7}{11}+\dfrac{4}{11}\)
=1
d)\(\left(\dfrac{3}{4}+0,5+25\%\right).2\dfrac{2}{3}\)
=\(\left(0,75+0,5+0,25\right).2\dfrac{2}{3}\)
=1,5.2\(\dfrac{2}{3}\)
=1,5.\(\dfrac{8}{3}\)
=\(\dfrac{3}{2}.\dfrac{8}{3}\)
=4
a)
b)
c)
a)
b)
c)
câu hỏi đâu?
He was friendly when he was young
1.B
2.B