Hỏi đáp về Dấu hiệu chia hết cho 3, cho 9

Cho 0<a≤b≤c .chứng minh rằng

\(\dfrac{a}{b}+\dfrac{b}{c}+\dfrac{c}{a}\)≥\(\dfrac{b}{a}+\dfrac{c}{b}+\dfrac{a}{c}\)

bài 1: một bác thợ lập kế hoạch lập một số sản phẩm, theo đó mỗi ngày bác phải làm 10 sản phẩm. Do cải tiến kĩ thuật nên bác làm được 14 sản phẩm mỗi ngày . Vì vậy, không nhữg hoàn thành xong trước 2 ngày so với kế hoạch mà còn thêm được 12 sản phẩm.

Hỏi theo kế hoạch tổng số sản phẩm mà bác thợ phải làm là bao nhiêu?

giúp mình nhá! mình cần gấp.

Rút gọn:

\(a\left(b+c-a\right)^2+b\left(c+a-b\right)^2+c\left(a+b-c\right)^2+\left(b+c-a\right)\left(c+a-b\right)\left(a+b-c\right)\)

lưu ý đg có làm kiểu hay là rồi rút gọn nha mấy bn có cái háng ngồi không :)

mà k làm đc thì cho lên câu hỏi hay giùm mk nha ace CTV :3

lẹ nha tối nay thôi T.T

một xe ô tô dự định đi từ A đến B với vận tốc 48km/h . sau khi đi được 1 h thì xe bị hỏng phải dừng lại sửa 15 phút . do đó để đến B đúng h dự định ô tô phải tăng vận tốc thêm 6km/h. tính quãng đường AB?

cho a, b là 2 số dương . Chứng minh rằng:

\(\left(1+\dfrac{a}{b}\right)^5+\left(1+\dfrac{b}{a}\right)^5\) ≥ 64

Tìm min 2x²+y²-2x-4y+2018-2xy

Tìm GTLN:

a) A=-x² +6x -5

b) B=-x²-3x+4

c) C=-3x²+2x -1

d) D=ax² + bx + c ( với a<0 ,abc là hằng số )

Cho biểu thức A =\(\dfrac{x+2}{x+3}\) - \(\dfrac{5}{x^2+x-6}\) + \(\dfrac{1}{2-x}\)

a, Tìm điều kiện của x để A có nghĩa

b, Rút gọn A

c, Tìm x để A=-3/4

d, Tìm x để biểu thức A có giá trị nguyên

e, Tính giá trị của biểu thức A khi x²-9=0

A=\(2^1+2^2+2^3+...+2^{59}+2^{60}\)

CMR : A⋮7

giải phương trình

\(\dfrac{x}{2\left(x-3\right)}+\dfrac{x}{2\left(x+1\right)}=\dfrac{2x}{\left(x+1\right)\left(x-3\right)}\)

Phân tích đa thức sau thành nhân tử : A=(a+1)(a+3)(a+5)(a+7)+15

Tìm x,biết:

\(8\times6+288:\left(x-3\right)^2=50\\ \)

1. Cho biểu thức M =2/n-1 (n khác 1). Tìm tất cả các số nguyên n để M có giá trị là số nguyên.

x²-4x+4=x-2 giải phương trình

a) Tìm giá trị nhỏ nhất: A= 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Cho a, b, c thỏa mãn: \(\dfrac{1}{a}+\dfrac{1}{b}+\dfrac{1}{c}=0\)

Tính giá trị biểu thức: A=\(\dfrac{b+c}{a}+\dfrac{c+a}{b}\dfrac{a+b}{c}\)

Cho a+b+c= 1, chứng minh rằng: a²+b²+c²\(\ge\)^{\(\dfrac{1}{3}\)}

Cho 3 số a,b,c thỏa mãn a+b+c=2.Tìm giá trị nhỏ nhất của biểu thức: \(A=a^2+b^2+c^2\)

Cho a,b,c là số đo ba cạnh của tam giác

Chứng minh rằng \(1< \dfrac{a}{b+c}+\dfrac{b}{c+a}+\dfrac{c}{a+b}< 2\)

Tìm x để biểu thức A=3x2−8x+6x2−2x+13x2−8x+6x2−2x+1đạt giá trị nhỏ nhất. Tính giá trị nhỏ nhất đó.

làm giùm mk nka mk sắp thi òi!!!!!!!!!!!

Tìm x để biểu thức A=\(\dfrac{3x^2-8x+6}{x^2-2x+1}\)đạt giá trị nhỏ nhất. Tính giá trị nhỏ nhất đó.

làm giùm mk nka mk sắp thi òi!!!!!!!!!!!

Giải các BPT sau :

a) 2x - 3 / 35 + x (x - 2) / 7 < x² / 7 - 2x - 3 / 5

b) 3x - 2 / 4 < 3x + 3 / 6

So sánh: \(\sqrt{1969}\)+\(\sqrt{1971}\) và 2\(\sqrt{1970}\)

mình nhờ các bạn giải hộ vài bài với, mình xin cảm ơn rất nhiều

1. Giải phương trình

a) (x+5)(2x+1) - x² + 25 = 0

b 3x/x-2 - x/x-5 + 3x/(x-2)(x-5) = 0

2 cho phương trình ẩn x

x+1/x+2+m = x+1/x+2-m

a) giải phương trình khi m = -3

b) tìm các giá trị m sao cho phương trình nhận x=3 làm nghiệm

Cho tam giác ABD vuông tại B, có AB= 6cm, AD= 10 cm. Trên cạnh AD lấy điểm C sao cho AC= AB

Cm: BC là tia phân giác của góc EBD