已知X²+2X-4=0,求2(X-1)²-X(X-6)+3的值想了半天,求步骤和式子,顺便讲讲,
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已知X²+2X-4=0,求2(X-1)²-X(X-6)+3的值想了半天,求步骤和式子,顺便讲讲,
已知X²+2X-4=0,求2(X-1)²-X(X-6)+3的值
想了半天,求步骤和式子,顺便讲讲,
已知X²+2X-4=0,求2(X-1)²-X(X-6)+3的值想了半天,求步骤和式子,顺便讲讲,
答:
x²+2x-4=0
2(x-1)²-x(x-6)+3
=2x²-4x+2-x²+6x+3
=x²+2x+5
=x²+2x-4+9
=0+9
=9