英文數學題

1. 4b×b/2
=2b^2

2. 3+2y-3+y
=3-3+2y-y
=y

3. 5y-2x÷xy
=5y-2x X 1/xy
=5y-2/y

4. 36y^3÷9y^2÷4 (y^3=y 3次)
=36/9/4y^3-2
=y^1
=y

5. a-5b×8÷10c
=a-40b÷10c
=a-4b÷c

6.(3e)^2÷(6e^2)^3×9e^2
=3^2e^2÷6^3e^6 X 9e^2
=9e^2÷216e^6 X 9e^2
=9÷216X9 e^2-6+2
=0.0046296e^-2 (=0.0046296/e^2)

計得快，可能有錯，check check先