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参考・概略です
0.75＝a、0.25＝b、1.35＝c、0.35＝d とすると
与式＝a²＋2ab＋b²－c²＋2cd－d²
＝{a²＋2ab＋b²}－{c²－2cd＋d²}
＝(a＋b)²－(c－d)²
●それぞれの値を代入し
＝(0.75＋0.25)²－(1.35－0.35)²
＝1²－1²
＝0
Mathematics
Junior High
Solved
2番教えて欲しいです！
次の式を
(1) 302×302-298×298
T8
(2) 0.75°+2×0.75×0.25+0.25°-1.35°+2×1.35×0.35-0.35°
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