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32⋅4−54⋅6+76⋅8−98⋅10+1110⋅12−⋯= ?\large\dfrac3{2\cdot4}-\dfrac5{4\cdot6}+\dfrac7{6\cdot8}-\dfrac9{8\cdot10}+\dfrac{11}{10\cdot12}-\cdots=\, ?2⋅43−4⋅65+6⋅87−8⋅109+10⋅1211−⋯=?
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