A = √ 18 − 2 √ 50 + 3 √ 8 ; B = √ 27 − 6 √ 1 3 + √ 3 − 3 √ 3 ; C = 5 √ 7 + √ 2 − √ 8 − 2 √ 7 + √ 2
A = √ 18 − 2 √ 50 + 3 √ 8 ; B = √ 27 − 6 √ 1 3 + √ 3 − 3 √ 3 ; C = 5 √ 7 + √ 2 − √ 8 − 2 √ 7 + √ 2
By Allison
By Allison
A = √ 18 − 2 √ 50 + 3 √ 8 ; B = √ 27 − 6 √ 1 3 + √ 3 − 3 √ 3 ; C = 5 √ 7 + √ 2 − √ 8 − 2 √ 7 + √ 2
Đáp án:
Giải thích các bước giải:
Bấm máy đuoẹc nhé
$A = 3 \sqrt{8} – 2 \sqrt{50} + 3 \sqrt{8} \\= – \sqrt{2} $
a) $A = \sqrt{18} – 2\sqrt{50} + 3\sqrt{8}$
$= \sqrt{9.2} – 2\sqrt{25.2} + 3\sqrt{4.2}$
$= 3\sqrt{2} – 2.5\sqrt{2} + 3.2\sqrt{2}$
$= -\sqrt{2}$
b) $B = \sqrt{27} – 6\sqrt{13} + \sqrt{3} – 3\sqrt{3}$
$= \sqrt{9.3} – 6\sqrt{13} – 2\sqrt{3}$
$= 3\sqrt{3} – 6\sqrt{13} – 2\sqrt{3}$
$= \sqrt{3} – 6\sqrt{13}$
c) $C = 5\sqrt{7} + \sqrt{2} – \sqrt{8} – 2\sqrt{7} + \sqrt{2}$
$= 3\sqrt{7} + \sqrt{2} – \sqrt{4.2} + \sqrt{2}$
$= 3\sqrt{7} + 2\sqrt{2} – 2\sqrt{2}$
$= 3\sqrt{7}$.