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=2√2-(-6√2)-2√5+15√5
=8√2-13√5
b.6×(√36×√2)-6(√4×√2)+(√4×√5)-3×(√9×√5)=6×6√2-6×2√2+2√5-3×3√5=36√2-12√2+2√5-9√5=24√2-7√5
c.√42-2√13+32+√16×√2=√42-2√13+32 +4√2
d.√3×√9+2×√81×√3-9-15=3√3+2×9√3-24=3√3+18√3-24=21√3-24