Mathematics
Senior High
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計算の仕方がわかりません
30+2b + c = 0 -0.
129 +4b+c=0
a+b+c+d=6-③.
8 a + 4 b + 2 c +d = 5-④
Answers
Answers
④-③
7a+3b+c=-1 ⑤
⑤-①
4a+b=-1 ⑥
②-①
9a+2b=0 ⑦
⑦-2⑥
a=2 ⑧
⑧を⑥に代入
b=-9 ⑨
⑧、⑨を①に代入
c=12 ⑩
⑧、⑨、⑩を③に代入
d=1
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