932+2×93×72+722-1312+2×131×96-962
(28-1)(54-1)104-54-24+1
472-2×47×13+132162-222+2×22×23+232242
解説動画 ≫
26000
17
1
932+2×93×72+722-1312+2×131×96-962
= (93+72)2-(131-96)2
= 1652-352
= (165+35)(165-35)
= 200×130
= 26000
(28-1)(54-1)104-54-24+1
= (28-1)(54-1)54(24-1)-(24-1)
= (28-1)(54-1)(24-1)(54-1)
= 28-124-1
= (24+1)(24-1)24-1
= 24+1
= 16+1
= 17
472-2×47×13+132162-222+2×22×23+232242
=(47-13)2162-(22+23)2242
=(3416)2-(4524)2
=(178)2-(158)2
=(17+158)(17-158)
=328×28
=1
【練習】
工夫して計算せよ。
332+2×33×24+242−692+2×69×26−262
1400
(34−1)(72+1)212+32−72−1
10
132+2×13×8+8262−192−2×19×7+7282
10