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10.A itu aja yang bisa saya jawab
10.A menurut saya.
u10=3+(1+2+3+4+...+9)
3+(9/2+(1+9))
3+45=48 (c)
7. u2=6
u7=31
u2=a+b=y
u7=a+6b=31 -
= -5b=-25
= b=5
a+b=6
a+5=6
a=6-5
a=1
u40=a+(n-1)b
=1+(40-1)5
=1+39×5
=1+195=196 (d)
9.waktu kecepatan
1,2jam 80km/jam
1jam x
x¹/x²= Y¹/y²
1,2/1 = 80/x
1,2x=80
x=66km/jam
10. (1). (X+y)(x-2y)
x²-xy+xy-2y² (salah)
x²-2y²
(2). (4x+5y)(4x-5y)
16x²-20y+20y-25y² (benar)
16x²-25y2
(3). (x+2)(3x-2)
3x²-2x+6x-4 (benarl
3x²+4x-4
(1) dan (3) (c)