摘要:17. (1)计算: (2) 用配方法解方程:
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(1)计算:
.
(2)请用指定的方法解下列方程:
①x2-9=0(用直接开平方法);
②x2-6x=7(用配方法);
③3x2-2=5x(用公式法);
④x2+3x=10(用分解因式法).
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(1)计算:
.
(2)请用指定的方法解下列方程:
①x2-9=0(用直接开平方法);
②x2-6x=7(用配方法);
③3x2-2=5x(用公式法);
④x2+3x=10(用分解因式法).
查看习题详情和答案>>
(2)请用指定的方法解下列方程:
①x2-9=0(用直接开平方法);
②x2-6x=7(用配方法);
③3x2-2=5x(用公式法);
④x2+3x=10(用分解因式法).
查看习题详情和答案>>
阅读理解:
计算(1+
+
+
)×(
+
+
+
)-(1+
+
+
+
)×(
+
+
)时,若把(
+
+
+
)与(
+
+
)分别各看着一个整体,再利用分配律进行运算,可以大大简化难度.过程如下:
解:设(
+
+
)为A,(
+
+
+
)为B,
则原式=B(1+A)-A(1+B)=B+AB-A-AB=B-A=
.请用上面方法计算:
①(1+
+
+
+
+
)(
+
+
+
+
+
)-(1+
+
+
+
+
+
)(
+
+
+
+
)
②(1+
+
…+
)(
+
…+
)-(1+
+
…+
)(
+
…+
).
查看习题详情和答案>>
计算(1+
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| 2 |
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解:设(
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| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
则原式=B(1+A)-A(1+B)=B+AB-A-AB=B-A=
| 1 |
| 5 |
①(1+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 2 |
| 1 |
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| 1 |
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| 1 |
| 5 |
| 1 |
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| 1 |
| 7 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
②(1+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n+1 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n+1 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n |
阅读理解:
计算(1+
+
+
)×(
+
+
+
)-(1+
+
+
+
)×(
+
+
)时,若把(
+
+
+
)与(
+
+
)分别各看着一个整体,再利用分配律进行运算,可以大大简化难度.过程如下:
解:设(
+
+
)为A,(
+
+
+
)为B,
则原式=B(1+A)-A(1+B)=B+AB-A-AB=B-A=
.请用上面方法计算:
①(1+
+
+
+
+
)(
+
+
+
+
+
)-(1+
+
+
+
+
+
)(
+
+
+
+
)
②(1+
+
…+
)(
+
…+
)-(1+
+
…+
)(
+
…+
).
查看习题详情和答案>>
计算(1+
| 1 |
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| 1 |
| 3 |
| 1 |
| 4 |
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| 2 |
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| 1 |
| 4 |
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| 1 |
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| 1 |
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| 1 |
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| 1 |
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| 1 |
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| 1 |
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解:设(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
则原式=B(1+A)-A(1+B)=B+AB-A-AB=B-A=
| 1 |
| 5 |
①(1+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
| 1 |
| 2 |
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| 1 |
| 7 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 6 |
②(1+
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n+1 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n+1 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| n |