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2次方程式のプリント
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2次方程式
レベル1 · 平方根の考え、因数分解された形
名前
組
方程式を解きなさい。
1.
x
2
=
121
x^2 = 121
x
2
=
121
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
2.
x
2
=
9
x^2 = 9
x
2
=
9
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
3.
x
2
−
1
=
0
x^2 - 1 = 0
x
2
−
1
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
4.
x
2
−
36
=
0
x^2 - 36 = 0
x
2
−
36
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
5.
2
x
2
=
18
2x^2 = 18
2
x
2
=
18
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
6.
5
x
2
=
20
5x^2 = 20
5
x
2
=
20
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
7.
(
x
−
8
)
(
x
+
7
)
=
0
(x - 8)(x + 7) = 0
(
x
−
8
)
(
x
+
7
)
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
8.
(
x
+
7
)
(
x
+
8
)
=
0
(x + 7)(x + 8) = 0
(
x
+
7
)
(
x
+
8
)
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
9.
x
(
x
+
3
)
=
0
x(x + 3) = 0
x
(
x
+
3
)
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
10.
x
(
x
−
1
)
=
0
x(x - 1) = 0
x
(
x
−
1
)
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
解答
2次方程式 · レベル1 · 平方根の考え、因数分解された形
1.
x
=
±
11
x = \pm 11
x
=
±
11
2.
x
=
±
3
x = \pm 3
x
=
±
3
3.
x
=
±
1
x = \pm 1
x
=
±
1
4.
x
=
±
6
x = \pm 6
x
=
±
6
5.
x
=
±
3
x = \pm 3
x
=
±
3
6.
x
=
±
2
x = \pm 2
x
=
±
2
7.
x
1
=
8
,
x
2
=
−
7
x_1 = 8,\; x_2 = -7
x
1
=
8
,
x
2
=
−
7
8.
x
1
=
−
7
,
x
2
=
−
8
x_1 = -7,\; x_2 = -8
x
1
=
−
7
,
x
2
=
−
8
9.
x
1
=
0
,
x
2
=
−
3
x_1 = 0,\; x_2 = -3
x
1
=
0
,
x
2
=
−
3
10.
x
1
=
0
,
x
2
=
1
x_1 = 0,\; x_2 = 1
x
1
=
0
,
x
2
=
1
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