Rút gọn biểu thức: A=[căn2(3+căn5)]/(2căn2+căn(3+căn5))+[căn2(3−căn5)]/[2căn2−căn(3−căn5
Giải thích
A=2(3+5)22+3+5+2(3−5)22−3−523+54+(5+1)2+3−54−(5−1)2=23+55+5+3−55−52(3+5)(5−5)+(3−5)(5+5)(5+5)(5−5)=215−35+55−5+15+35−55−525−5=2.2020=2Vậy A=2
A=2(3+5)22+3+5+2(3−5)22−3−523+54+(5+1)2+3−54−(5−1)2=23+55+5+3−55−52(3+5)(5−5)+(3−5)(5+5)(5+5)(5−5)=215−35+55−5+15+35−55−525−5=2.2020=2Vậy A=2