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2014-10-28T13:08:22+02:00
-4√4*5+√9*5=-4√2 la patrat*5+√3 la patrat*5=-8√5+3√5=-5√5
2 3 2
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2014-10-28T13:30:34+02:00
0,4√12-0,9√27+1,3√75=0,4(√3*4)-0,9(√9*3)+1,3(√25*3)=0,4*2*√3-0,9*3*√3+1,3*5√3=0,8√3-2,7√3+6,5√3=(0,8-2,7+6,5)√3=4,6√3
-2√80 + √320=-2(√16*5)+(√16*4*5)=-2*4√5+4*2√5=0
-4√20+√45=-4(√4*5)+(√9*5)=-4*2√5+3√5=-8√5+3√5=(-8+3)√5=-5√5