问题
解答题
(1)计算:
(2)化简求值:已知a=3+2
|
答案
(1)原式=3
-3
=23
;3
(2)原式=ab(a-b),
∵a=3+2
,b=3-25
,5
∴ab=(3+2
)(3-25
)=-11,5
∴a-b=(3+2
)-(3-25
)=45
,5
∴原式=-11×4
=-445
.5
(1)计算:
(2)化简求值:已知a=3+2
|
(1)原式=3
-3
=23
;3
(2)原式=ab(a-b),
∵a=3+2
,b=3-25
,5
∴ab=(3+2
)(3-25
)=-11,5
∴a-b=(3+2
)-(3-25
)=45
,5
∴原式=-11×4
=-445
.5