2. จงกระจายนิพจน์ต่อไปนี้โดยใช้สมบัติการแจกแจง
1) 5(x + 1)
วิธีทำ
5(x + 1)
=
=
=
[5(x)] + (5 X 1)
5x + 5
5x + 5
ตอบ 5x + 5
2) 2(3m + 2)
วิธีทำ
2(3m + 2)
=
=
=
(2 X 3m) + (2 X 2)
6m + 4
6m + 4
ตอบ 6m + 4
3) -4(y + 8)
วิธีทำ
-4(y + 8)
=
=
=
=
=
[(-4)(y)] + [(-4) x 8]
(-4y) + (-32)
-4y – 32
(-4y) + (-32)
-4y – 32
ตอบ -4y – 32
4) -2(a – 5)
วิธีทำ
-2(a – 5)
=
=
=
=
=
[(-2)(a)] – [(-2) X (5)]
(-2a) – (-10)
-2a + 10
(-2a) – (-10)
-2a + 10
ตอบ -2a + 10
5) 10(8 – x)
วิธีทำ
10(8 – x)
=
=
=
(10 X 8) – [10(x)]
80 – 10x
80 – 10x
ตอบ 80 – 10x
6) 6(11 – 2x)
วิธีทำ
6(11 – 2x)
=
=
=
(6 X 11) – [6(2x)]
66 – 12x
66 – 12x
ตอบ 66 – 12x
7) -3(10 – m)
วิธีทำ
-3(10 – m)
=
=
=
=
=
[(-3) X 10] – [(-3)m]
(-30) – (-3m)
-30 + 3m
(-30) – (-3m)
-30 + 3m
ตอบ -30 + 3m
8) -5(8 – 2a)
วิธีทำ
-5(8 – 2a)
=
=
=
=
=
[(-5) X 8] – [(-5) X (2a)]
(-40) – (-10a)
-40 + 10a
(-40) – (-10a)
-40 + 10a
ตอบ -40 + 10a