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Trandoanh
2 năm trước
giúp mình với I .Trắc nghiệm C1:Cho biểu thức 1 > b A,-3a < -3b C,-5a ≤ -5b B,-3a - 3b D,-29+1 > 2b+1 C2:Điều kiện của M do(m-3)x+4=0 là PT bậc nhất 1 ẩn A,m ≠ 0 B,m>3 C,m≠3 D,m<3 C3:Hình hộp chữ nhật có bao nhiêu cặp mặt phẳng song song với nhau A,2 B,3 C,4 D,6 II.Tự luận C1:Một người đi xe máy từ A-->B với vận tốc 45km/h,đến B người đó nghỉ 1h,rồi quay trở về A với vận tốc 30km/h,biết tổng thời gian cả đi cả về và thời gian nghỉ ở B là 7h.Tính quãng đường AB C2:Giải PT: a,3x-4=0 b,3x+2 x-3 ------- = --------- 4 3 C3:giải BPT: a,3x-1050 b,7x+4 ≤ 3x-8
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