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liền sau là 31
Số tiền của 15 quyển vở trước khi giảm giá là
15.7000=105000=105 000000 (đồng)
Số tiền của 1515 quyển vở sau khi giàm giá là:
105105 000.90%=94000.90%=94 500500 (đồng)
vậy bạn mang 100 000 đồng nên đủ tiền để mua 15 quyển vở
a) 1−\(\dfrac{1}{3}\)=\(\dfrac{6-3+2}{6}\)=\(\dfrac{5}{6}\)
b)\(\dfrac{2}{5}\)+ \(\dfrac{3}{5}\):\(\dfrac{9}{10}\)
=\(\dfrac{2}{5}\)
+\(\dfrac{3}{5}\)
⋅\(\dfrac{10}{9}\)
=\(\dfrac{2}{5}\)+\(\dfrac{2}{3}\)=\(\dfrac{16}{15}\)
c) \(\dfrac{7}{11}\)
⋅\(\dfrac{3}{4}\)
+\(\dfrac{7}{11}\)
⋅\(\dfrac{1}{4}\)+\(\dfrac{4}{11}\)
=\(\dfrac{7}{11}\)
(\(\dfrac{3}{4}\)+\(\dfrac{1}{4}\))+\(\dfrac{4}{11}\)=\(\dfrac{7}{11}\)+\(\dfrac{4}{11}\)=1711⋅34+711⋅14+411=711(34+14)+411=711+411=1.
d) (\(\dfrac{3}{4}\)+0,5+25%)⋅2\(\dfrac{2}{3}\)=(\(\dfrac{3}{4}\)+\(\dfrac{1}{2}\)+\(\dfrac{1}{4}\))⋅\(\dfrac{8}{3}\)=\(\dfrac{3}{2}\)⋅\(\dfrac{8}{3}\)=4(34+0,5+25%)⋅223=(34+12+14)⋅83=32⋅83=4.
a, các tia chung gốc A là: Ax;AM;AC;Az;AB;Ay
b, Các điểm thuộc tia Az mà không thuộc tia Ay là: điểm M và điểm C
c, điểm AM và MA không đối nhau vì đấy là hai tia giống nhau