Bài 1: Để giúp đỡ hs nghèo, các bạn hs của 3 lớp 6 đã quyên góp được 1 số quuển vở. Lớp 6A quyên góp được 72 quyển vở. Số quyển vở lớp 6B quyên góp được = 5/6 của lớp 6A và =80% của lớp 6C. Hỏi cả 3 lớp quyên góp được bao nhiêu quyển vở??

Làm nhak giúp mk nha

thực hiện phép tính

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mình làm như thế này đúng hay sai. nếu đúng trả lời mình nhé

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Trên cùng một nửa mặt phẳng bờ chứa tia ox ve hai tia oy và oz sao cho góc xôy =30độ , xôz =60độ

a, Trong ba tia ox, oy, oz tia nào nằm giữa hai tia còn lại? Vì sao?

b, Tia oy có phải là tia phân giác của góc xôz không Vì sao?

Nhớ vẽ hình ra nhé

Thanks

a,\(\dfrac{121.75.130.169}{39.60.11.198}\)

b,\(\dfrac{5^{11}.7^{12}+5^{11}.7^{11}}{5^{12}.7^{12}.9.5^{11}.7^{11}}\)

Tìm a \(\in\) N biết 355chia cho a dư 13 và 836 chia cho a thì dư 8

\(\dfrac{-2}{5}.\dfrac{5}{8}+\dfrac{5}{8}.\dfrac{3}{5}\)

tính Q = \(\dfrac{1+\dfrac{1}{3}+\dfrac{1}{5}+\dfrac{1}{7}+...+\dfrac{1}{99}}{\dfrac{1}{1.99}+\dfrac{1}{3.97}+\dfrac{1}{5.95}+...+\dfrac{1}{97.3}+\dfrac{1}{99.1}}\)

2và 3/4x - 1và 4/5x = 1

(mk viết mấy cái kia là hỗn số nhé)

Tìm số tự nhiên nhỏ nhất ,biết rằng khi chia số đó cho 29 dư 5 còn chia cho 31 dư 28

a, \(\left(1+\dfrac{1}{2}\right)\left(1+\dfrac{1}{2^2}\right)\left(1+\dfrac{1}{2^3}\right)\left(1+\dfrac{1}{2^4}\right)-\left(1+\dfrac{1}{2^{50}}\right)< 3\)

b, \(\dfrac{1}{2}-\dfrac{1}{2^2}+--.+\dfrac{1}{2^{99}}-\dfrac{1}{2^{100}}< \dfrac{1}{3}\)