Bonjour,
2√2-3√2+4√2-√2=6√2-4√2=2√2
2√2×(-5√3)=-10√(3×2)=-10√6
3√2×7√8=21×√(2×8)=21√16=21×4=84
√20+√45-√75=2√5+3√5-5√5=0
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Bonjour,
2√2-3√2+4√2-√2=6√2-4√2=2√2
2√2×(-5√3)=-10√(3×2)=-10√6
3√2×7√8=21×√(2×8)=21√16=21×4=84
√20+√45-√75=2√5+3√5-5√5=0