Mathematics
Senior High
Resolved

この式になるのはなぜでしょうか?
教えてください。

(3) 110+90+70+・・・・ + (-50 ) 第30項 J= 30x (110-470) 2 = 30x (-360) 2 = 30 x ( - 180 ) = - 5400 a = 110 d=-20 an = 110-20(h-1) = -20h +130 Q30-20x30 +130 = -470

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