X²-4 + x²-3x+2
_____________ ,para x =7
x+2 + x-1
qual e o valor da expressao?
_____________ ,para x =7
x+2 + x-1
qual e o valor da expressao?
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49-4+49-3×7+2=
49-4+49-21+2
45+28+2
75
7+2+7-1
9+6
15