中二數學問題求幫忙(15點)

1.-√0.81
=-0.9

2.-√4 29/49(四又29分之49)
=-√225/49
=-15/7
NOTE:帶分數要轉做假分數先至好simplify
Evaluate
3.(6√3)+(5√3)-(3√3)
=√3(6+5-3)
=8√3

4.(√125)-(√5)
=5√5-√5
=√5(5-1)
=4√5

5.(5√2)-(√8)+(3√2)
=5√2-2√2+3√2
=√2(5-2+3)
=6√2

6.(√8)*(√18)
=2√2 x 3√2
=6x2
=12

Rationalize
7.(3√2)/(√3)
=3√6/3
=√6

8.(-√2)/(√8)
=-√2/2√2
=-1/2

9.√(49/2)
=7/√2
=7√2/2

10.(4√15)/(√10)
=4√3/√2
=4√6/2
=2√6

1)-0.9
2)-2又7份之1
3)24.3
4)9
5)8.5
6)i don't know,sorry~~
7)7.14
8)-3.92
9)4.9
10)49.6
我5知啱5啱嫁