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dinhhuudiem
2 năm trước
Cho tam giác abc vuông tại a ( ab lớn hơn a ) . gọi m là trung điểm của bc . trên tia đối tia ma lấy d sao cho md=ma. a, cho ab = 8 cm ; bc = 10 cm . tính ac? b, c/m . tam giác amb= tam giác dmc c, vẽ ah vuông góc với bc tại h ,trên tia đối của ah lấy e sao cho he=ha . c/m . tam giác ace cân d, c/m . bd=ce.
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