Two thirds plus five thirds equals seven thirds, two and one third.

9 divided by 3 equals 3.

Nine divided by three equals three.

Geng Hao 5 ..

Square root five

Square of 2, cube of 2 and cube of 2 (a cube is a cube)

Two squares, two cubes

X plus y plus six tenths of X.

X+6 divided by y+X.

(2+4X)x(6 plus y)

The sum of two plus four x times the sum of six plus y.

5(6+X)

Five times the sum of six plus x

Multiplication, you can use time or multiplication.

Subtraction, you can use subtraction or subtraction.