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tuanhtruong0106
2 năm trước
Bài 1 . trên cùng nửa mặt phẳng bờ chứa tia Ox vẽ 3 tia Oz,Oy, Ot sao cho xoy =50*, xoz=75*,xot=100* a, kể tên các góc b, tia nào là tia phân giác của góc Bài 2 Tìm x a, (3/4x + 2 và 1/4)nhân -2/3=1/8 b, 1/3x-0,5=0,75 Bìa 3 Rút gọn A=1+1/2 +1/2^2 +1/2^3+....+1/2^2009
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