各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (34)

1a) 5a × 2b=10ab
1b) 3y × y=3y^2
1c) 4y × 3xy=12xy^2
1d) a × a × 3=3a^2
1e) 5y × 2x=10xy
(Note: "^"是 "的次方".例如: 2^3=2的3次方)

a) 5a × 2b
=5*2*a*b
=10ab
b) 3y × y
=3(y*y)
=3y^2
c) 4y × 3xy
=4*3*x*y*y
=12xy^2
d) a × a × 3
=3*a*a
=3a^2
e) 5y × 2x
=5*2*x*y
=10xy

1a) 5a × 2b
=10ab
1b) 3y × y=
=3y
1c) 4y × 3xy=
=12y
1d) a × a × 3=
=3a
1e) 5y × 2x=
=10xy

一定對!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

a) 5a × 2b
=5× 2×a× b
=10ab

b) 3y × y
=3×y×y

=3y (y要square)

c) 4y × 3xy
=4×3× x ×y×y

=12xy (y要square)

d) a × a × 3

=3a (a要square)

e) 5y × 2x
=5×2×y× x
=10yx

Sorry!由於唔識點樣打二次方，所以只能在需要二次方的地方提醒你

a)(5*2)(a*b)=10ab

b)3(y*y)=3y2^2

c)(4*3)x(y*y)=12xy^2

d)(a*a)3=3a^2

e)(5*2)yx=10yx

^是次方

a)
5a × 2b
=5．2．a．b
=10ab

b)
3y × y
=3．y．y
=3y^2

c)
4y × 3xy
=4．3．x．y．y
=12xy^2

d)
a × a × 3
=3a^2

e)
5y × 2x
=5．2．x．y
=10xy