Question

Scoateti  factori de sub radical si aduceti expresia la o forma mai simpla:
a)√18-3√32+2√8-√72
b)0,4√12-0,9√27+1,3√75

Answer 1

a)√18=3√2
8√32=8·4√2=32√2
2√8=8√2
√72=6√2
3√2-32√2+8√2-6√2=29√2+6√2-6√2=35√2-6√2=29√2
b)0,4√12=3·0,4√3=1,2√3
0,9√27=0,9·3√3=2,7√3
1,3√75=1,3·5√3=6,5√3
1,2√3-2,7√3+6,5√3=-1,5√3+6,5√3=5√3