题目内容
(1)求下列各式中的x:①x2-25=0;②64(x+1)3=27;
(2)计算:2-1+
-
+(
)0.
(2)计算:2-1+
| 4 |
| 3 | 8 |
| 2 |
(1)①x2-25=0
x2=25
x=±5;
②64(x+1)3=27
(x+1)3=
x+1=
x=-
;
(2)2-1+
-
+(
)0
原式=
+2-2+1
=
.
x2=25
x=±5;
②64(x+1)3=27
(x+1)3=
| 27 |
| 64 |
x+1=
| 3 |
| 4 |
x=-
| 1 |
| 4 |
(2)2-1+
| 4 |
| 3 | 8 |
| 2 |
原式=
| 1 |
| 2 |
=
| 3 |
| 2 |
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