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nilai dari
a) a - 2bc + 3a
-2 - 2(2 x -1) + 3 x -2
-2 -2(-2) + -6
-2 + 4 + -6
-4
b) 2a²b + 4ac
2(-2²)(2) + 4(-2)(-1)
2(4)(2) + 4(2)
16 + 8 = 24