12+69+58+30+587+35=

=(12+69)+(58+30)+(587+35)

=(81+88)+622

=169+622

=791

12 + 69 + 58 + 30 + 587 + 35 = 791

4x + -5y = 35 Solving 4x + -5y = 35 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5y' to each side of the equation. 4x + -5y + 5y = 35 + 5y Combine terms: -5y + 5y = 0 4x + 0 = 35 + 5y 4x = 35 + 5y Divide each side by '4'. x = 8.75 + 1.25y Simplifying x = 8.75 + 1.25y

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bye

(X-3/4)²-1=8

(X-3/4)²=8+1

(x-3/4)²=9

(x-3/4)²=3²

X-3/4=3

X=3+3/4

X=15/4

a) \(A=-\left|x+\frac{3}{4}\right|-3\)

Vì \(\left|x+\frac{3}{4}\right|\ge0\Rightarrow-\left|x+\frac{3}{4}\right|\le0\Rightarrow A=-\left|x+\frac{3}{4}\right|-3\le-3\)

=>\(A_{max}=-3\)=> \(\left|x+\frac{3}{4}\right|=0\Rightarrow x+\frac{3}{4}=0\Rightarrow x=-\frac{3}{4}\)

Vậy A_max = -3 khi x=-3/4

b) \(B=2-\left(x+\frac{5}{6}\right)^2\)

Vì \(\left(x+\frac{5}{6}\right)^2\ge0\Rightarrow B=2-\left(x+\frac{5}{6}\right)^2\le2\)

=>\(B_{max}=2\Rightarrow\left(x+\frac{5}{6}\right)^2=0\Rightarrow x+\frac{5}{6}=0\Rightarrow x=-\frac{5}{6}\)

Vậy B_max=2 khi x=-5/6

x ^ 3 + y ^ 3 = 9

\(x^3+y^3=5+3=8\)