tolong bantu jawab nomor 3,4,5,6,7 disetor besok

3.
√180 = √9*4*5 = 3*2√5 = 6√5
2√45 = 2√9*5 = 2*3√5 = 6√5

√180 + 2√45 - 4√5 = 6√5 + 6√5 - 4√5 = 8√5
(D)


4.
138 - 130 = 8
130 - 123 = 7
123 - 117 = 6
117 - 112 = 5

112 - X = 4
108 = X

108 - Y = 3
Y = 105
(A)


5.
L : P = 2 : 5
P - L = 5x-2x = 3x = 150
x = 50

total = 7x = 7(50) = 350 (c)

6.
1 rim = 5,6 cm
1 lembar = 5,6/400 = 0,014 cm (B)

7.
100 + 120 = 220cm (D)