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★Matematika★1) Tidak tahu
2) -a² + 2b - 3c
= -(-1)² + 2(-3) -(5)
= 1² + (-6)-5
= 1 +(-11)
= (-10)
(2y-(-3y)+(-3x-(-5x)+(-2-5)
5y-2x-7
2.-12+(2.-3)(-3.5)=1-6-15=-5-15=-20
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