Find the value of y such that:
1.1 x 1.2 x 1.3 x y= y x 2.1 x 2.2 x 2.3
1/- Four friends eating four pizzas that Jame size . John has 2/5 left , James has 1/3 left , Jacob has 1/4 left and Billy has 3/5 left . Who eats the most amount of Pizza ?
2/- Find the value of y such that : 1.1 x 1.2 x 1.3 x y = y x 2.1 x 2.2 x 2.3. Answer: y = ?
1.1*1.2*1.3*y =2.3*2.2*2.1*y
tim y
Find the value of y such that 1,1 x 1,2 x 1,3 x y = y x 2,1 x 2,2 x 2,3
Vì y = y mà các thừa số kia lại khác nhau => y = 0 thì 2 phép tính trên mới bằng nhau
Find the values of x and y such that 3x=5y and 2x-3y=5 .
Answer: The value of x and y are ............., respectively.
(used ";" between the numbers)
3x=5y
=>x/5=y/3
=>2x/10=3y/9=2x-3y/10-9=5/1=5(tính chất dãy tỉ số bằng nhau)
Find the value of x such that . x - y = 13; 3/10x = 9/4y
Answer: x = ?
dễ thôi mà \(\frac{3}{10}x=\frac{9}{4}y\Rightarrow\)\(\frac{9}{30}x=\frac{9}{4}y\)
\(\Rightarrow4x=30y\)(x là 30 phần ; y là 4 phần)
Áp dụng lại dạng toán tổng-hiệu của lớp 4
Hiệu số phần bằng nhau là :
30 - 4 = 26 (phần)
Vậy x =
\(\frac{13}{26}\cdot30=\frac{1}{2}\cdot30=15\)
Find the value of x such that x-y=13; 3/10x=9/4y
x=?
Find the value qf x and y such that: \(2^{x+2}.5^y=10^{2x}\) . Answer x = .........., y = .............
\(2^{x+2}.5^y=10^{2x}=\left(2.5\right)^{2x}=2^{2x}.5^{2x}\)
=>
+)\(2^{x+2}=2^{2x}=>x+22=x=>2x-x=2=>x=2\)
+)\(5^y=5^{2x}=>y=2x=>y=2.2.=4\)
tick nhé
Suppose that x = y - 3. Find the value of
B = y(y+5)-x(5-x)+7-2xy
B = y(y+5)-x(5-x)+7-2xy
B = y(y+5) - (y-3)(5-y+3) + 7 - 2(y-3)y
B = y(y+5) - (y-3)(8-y) + 7 - 2(y-3)y
B = y2+5y-8y+y2+24-3y+7-2y2+6y
B = (y2+y2-2y2)+(5y-8y-3y+6y)+(24+7)
B = 24+7
B = 31
Given x,y such that x^2-y^2=2. The value of expression A=2(x^6-y^6)-6(x^4+y^4)
x^2-y^2=2=(x-y).(x+y)
ta co bang
x-y 1 2 -1 -2
y+x 2 1 -2 -1
x 1.5 -1.5
y 0.5 -0.5