√2·√8=√(2·8)=√16=4
3√2·5√2=3·5·√2·√2=15√(2·2)=15√4=15·2=30
√2·√8-3√2·5√2=4-30=-26
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√2·√8=√(2·8)=√16=4
3√2·5√2=3·5·√2·√2=15√(2·2)=15√4=15·2=30
√2·√8-3√2·5√2=4-30=-26
4-15×2=4-30=-26