解得a=
| 1 |
| 3 |
所以，ab=
| 1 |
| 3 |
∵32=9，
∴ab的算术平方根是3．
已知1−3a与b−27互为相反数，求ab的算术平方根．
已知
与
互为相反数，求ab的算术平方根．
| 1−3a |
| b−27 |
数学人气：985 ℃时间：2019-08-21 10:38:38
优质解答
根据题意得，1-3a=0，b-27=0，
解得a=
，b=27，
所以，ab=
×27=9，
∵32=9，
∴ab的算术平方根是3．
解得a=
所以，ab=
∵32=9，
∴ab的算术平方根是3．
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