If the edge length of a cube is increased by 4cm, it will become a cuboid. The surface area of the cuboid is just 80 square percent more than that of the original cube Meters, the original cube volume. Urgent, fast, best before 9 o'clock It's not 8000

If the edge length of a cube is increased by 4cm, it will become a cuboid. The surface area of the cuboid is just 80 square percent more than that of the original cube Meters, the original cube volume. Urgent, fast, best before 9 o'clock It's not 8000

The edge length of a cube is 80 / 4 / 4 = 5 (CM)
The volume of a cube is 5 × 5 × 5 = 125 (cubic centimeter)

Solution equation: 3x2-4x + 1 = 0

3x2-4x+1=03（x2-43x）+1=0（x-23）2=19∴x-23=±13∴x1=1，x2=13

Given the square of x plus the square of y plus 2x plus 6y plus 10 = 0, find the value of x plus y

From the meaning of the title, we can get X & # 178; + Y & # 178; + 2x + 6y + 10 = 0
（x+1）²+（y+3）²=0
So x = - 1, y = - 3