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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
=
64
x^2 = 64
x
2
=
64
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
2.
x
2
=
144
x^2 = 144
x
2
=
144
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
3.
x
2
−
16
=
0
x^2 - 16 = 0
x
2
−
16
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
4.
x
2
−
81
=
0
x^2 - 81 = 0
x
2
−
81
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
5.
3
x
2
=
108
3x^2 = 108
3
x
2
=
108
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
6.
4
x
2
=
64
4x^2 = 64
4
x
2
=
64
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
7.
(
x
+
7
)
(
x
+
3
)
=
0
(x + 7)(x + 3) = 0
(
x
+
7
)
(
x
+
3
)
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
8.
(
x
−
9
)
(
x
−
7
)
=
0
(x - 9)(x - 7) = 0
(
x
−
9
)
(
x
−
7
)
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
9.
x
(
x
+
6
)
=
0
x(x + 6) = 0
x
(
x
+
6
)
=
0
x
1
=
x_1 =
x
1
=
x
2
=
x_2 =
x
2
=
10.
x
(
x
+
4
)
=
0
x(x + 4) = 0
x
(
x
+
4
)
=
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
=
±
8
x = \pm 8
x
=
±
8
2.
x
=
±
12
x = \pm 12
x
=
±
12
3.
x
=
±
4
x = \pm 4
x
=
±
4
4.
x
=
±
9
x = \pm 9
x
=
±
9
5.
x
=
±
6
x = \pm 6
x
=
±
6
6.
x
=
±
4
x = \pm 4
x
=
±
4
7.
x
1
=
−
7
,
x
2
=
−
3
x_1 = -7,\; x_2 = -3
x
1
=
−
7
,
x
2
=
−
3
8.
x
1
=
9
,
x
2
=
7
x_1 = 9,\; x_2 = 7
x
1
=
9
,
x
2
=
7
9.
x
1
=
0
,
x
2
=
−
6
x_1 = 0,\; x_2 = -6
x
1
=
0
,
x
2
=
−
6
10.
x
1
=
0
,
x
2
=
−
4
x_1 = 0,\; x_2 = -4
x
1
=
0
,
x
2
=
−
4
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