Mathematics
Junior High
なぜ36÷2をして9になるんですか？
電卓だと違う答えが
(東京)
(2) x'+6x+2=0
xf6x=-2
a'+6x+9=-2+9両辺に(20)=9を加える
(x+3)²=7
x+3=±√7
x=-3+√7
c = -3± 1
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