Mathematics, 29.07.2021 05:20 nisslove

1. Giải phương trình a) 2(x - 1) = 3(1- x) ; b) (x – 1)(5x + 4) = 0
2. Một người đi xe đạp từ A đến B với vận tốc 15 km /h. Lúc về người đó đi với vận tốc 12km/h nên thời gian về lâu hơn thời gian đi là 45 phút. Tính quãng đường AB ?
3. Cho tam giác ABC vuông tại A, đường cao AH.
a) Chứng minh rằng: Tam giác ABC đồng dạng với tam giác HAC.
b) Gọi M và N lần lượt hình chiếu của điểm H lên cạnh AB, AC.
Chứng minh AM. AB = AN. AC

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1. Giải phương trình a) 2(x - 1) = 3(1- x) ; b) (x – 1)(5x + 4) = 0
2. Một người đi xe đạp từ...

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