Đáp án:
Giải thích các bước giải:
Thay `a + c = 2b` vào 2`bd = c(b + d)` ta được
(`a + c) . d = c(b + d)`
`⇔ ad + cd = cb + cd`
`⇔ ad + cd - cd = cb`
`⇔ ad= cb`
⇔` a/b = c/d`
$\text{Ta có 2bd=c(b+d)}$
$\text{⇔ (a+c)d=cb+cd}$
$\text{⇔ ad+cd=cb+cd}$
$\text{⇔ ad=cb }$
⇔$\frac{a}{d}$= $\frac{c}{d}$
Nhân vật có phải là thừ Hán Việt ko
Mọi người vẽ hộ em sơ đồ tư duy củng cố tất cả kiến thức đã học trong bài: MỘT SỐ TÍNH CHẤT CHÍNH CỦA ĐẤT TRỒNG sgk công nghệ lớp 7 với ạ
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giúp mik với ko lấy trên mạng nha plssss
Giúp em câu 4 với ạ Em cám mơn nhìu
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x^2(x^2-4)-x^2+4 phân tích thành nhân tử
tất cả các giá trị của m để hàm số y =x ³ /3 -(m-1)x ²+2(m-1)x + 2 đồng biến trên tập xác định của nó là a 1 ≤ m ≤3 b m ≤3 c.m ≥1 d. 1<m<3
Viết một bài văn thuyết minh về chiếc nón lá.(Không chép mạng)
Giải giúp mình với mình cần gấp ạ
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