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U=4i+2j,v=6i-2j sa se calculeze w=2×u-3v

Răspuns :

2u=2*(4i+2j)=8i+4j
3v=3*(6i-2j)=18i-6j
2u-3j=8i+4j-(18i-6j)=8i+4j-18i+6j=-10i+10j