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Resposta:
a)-1300. b)420,00
Explicação passo-a-passo:
a) a= -10
b= -2
a²-3a²b²
-10² - 3 × -10² × -2²
-100 - 3 × 100 × 4
-100 - 1200
-1300
b) -216,25 + x = 203,75
x = 203,75 + 216,25
x = 420,00