Question

Tolong dijawab.....................................

Answer 1

1) 2.x + 2.(-4) + (-3).2x + (-3).1 = 2x-8-6x-3
= 2x-6x-8-3
= -4x-11

2) 2.(3x+1) krg dr sm dg 4.(x-3)
2.3x + 2.1 krg dr sm dg 4.x + 4.(-3)
6x + 2 krg dr sm dg 4x-12
6x-4x krg dr sm dg -12-2
2x krg dr sm dg -14
x lbih besar sm dg -14/2
x lbih besar sm dg -7


3) 3x-2x = -15-5
x = -20


4) 2x - 1/2 = x + 3/4
kdua ruas dikalikan dg KPK penyebut = 4,menjadi :
4.(2x-1/2) = 4.(x+3/4)
2x -2 = 4x + 3
2x -4x = 3+2
-2x = 5
x = -5/2 = -2 1/2


5) sudut A = sudut C
180 = 3x+13
180-13 = 3x
167 = 3x -------> x = 167/3 = 55,67˚


6) L = 1/2.d1.d2 ------> d2 = 2.L/d1
= 2.300/30
= 600/30
= 20 cm


7) sisi = K : 4
= 160 : 4 = 40 cm -----> L = s²
= 40² = 1600 cm²