如图,AF=DC,BC∥EF,请只补充一个条件,使得△ABC≌△DEF,并说明理由.
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求代数式(a+2b)(a-2b)+(a+2b)
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观察下列等式
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根据上述规律,计算sin
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如图,一次函数y=kx+b的图象与正比例函数y=2x的图象平行且经过点A(1,-2),则kb=
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