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a. 28
b. 12 x 15 = 180
c. 192
d. 405
e. -1430
f. -720
nomer 4
a. -304
b. -504
c. -221
d. -95
nomer 5
a. benar
-7 x 29 = -7 x (30 - 1) = (-7 x 30) - (-7 x -1)
b. salah
-9 X 56 = -9 x (60 - 4)
c. benar
-6 x 83 = -6 x (90 - 7 )
d. salah
-9 x 147 = -9 x (150 - 3) = (-9 x 150) - (-9 x 3)