Tolong kasih caranya ya

1.246:6+12x(-9)
=41-108
=-67

3. 2^-3+4^-2
=1/2^3 +1/4^2
=1/8+1/14
=2+1/16
=3/16

4.2√2+2√8-2√32
=2(√2+√8-√32)
=2(√2+2√2-4√2)
=2(-√2)
=-2√2