4/ Rút gọn
P= 212 . 35 - 46 . 36
212 . 93 + 84 . 36
Tính rồi rút gọn
a, 1 + 3 6 =
b, 18 4 - 2 =
c, 3 4 × 4 6 =
d, 3 5 : 4 6 =
Tính giá trị biểu thức:
212 x 13 + 84 x 68 / 46 x 33
/ là phần
Rút gọn
P = \(\sqrt{x+\sqrt{2x-1}}-\sqrt{x-\sqrt{2x-1}}\)
Rút gọn
P=\(\dfrac{x+2\sqrt{x}}{\sqrt{x}}-\left(3-\sqrt{x}\right)\)
\(=\dfrac{\sqrt{x}\left(\sqrt{x}+2\right)}{\sqrt{x}}-3+\sqrt{x}\)
\(=\sqrt{x}+2-3+\sqrt{x}=2\sqrt{x}-1\)
ĐK: \(x>0\)
Khi đó:
\(P=\dfrac{\sqrt{x}\left(\sqrt{x}+2\right)}{\sqrt{x}}-3+\sqrt{x}\\ =\sqrt{x}+2-3+\sqrt{x}\\ =2\sqrt{x}-1\)
\(P=\dfrac{x+2\sqrt{x}}{\sqrt{x}}-\left(3-\sqrt{x}\right)\\ =\dfrac{\sqrt{x}\left(\sqrt{x}+2\right)}{\sqrt{x}}-\left(3-\sqrt{x}\right)\\ =\sqrt{x}+2-3+\sqrt{x}\\ =2\sqrt{x}-1\)
Tính nhanh
24 : 4 + 36 : 4
84 : 7 - 35 : 7
(1) 24 : 4 + 36 : 4
= ( 24 + 36 ) : 4
= 60 : 4
= 15
(2) 84 : 7 – 35 : 7
= ( 84 – 35 ) : 7
= 49 : 7
= 7
Chúc bạn học tốt nhe >w<
CÓ KQ ĐÂY R
a) 24 : 4 + 36 : 4
= ( 24 + 36 ) : 4
= 60 : 4
= 15
b) 84 : 7 - 35 : 7
= ( 84 - 35 ) : 7
= 49 : 7
= 7
a; \(\dfrac{9}{27}\) + \(\dfrac{7}{-49}\)
= \(\dfrac{1}{3}\) - \(\dfrac{1}{7}\)
= \(\dfrac{7}{21}\) - \(\dfrac{3}{21}\)
= \(\dfrac{4}{21}\)
b; - \(\dfrac{12}{10}\) + \(\dfrac{-25}{30}\)
= - \(\dfrac{6}{5}\) - \(\dfrac{5}{6}\)
= -\(\dfrac{36}{30}\) - \(\dfrac{25}{30}\)
= \(\dfrac{-61}{30}\)
c; \(\dfrac{-20}{35}\) + \(\dfrac{-16}{-24}\)
= - \(\dfrac{4}{7}\) + \(\dfrac{2}{3}\)
= - \(\dfrac{12}{21}\) + \(\dfrac{14}{21}\)
= \(\dfrac{2}{21}\)
d; - \(\dfrac{21}{77}\) + \(\dfrac{10}{-35}\)
= - \(\dfrac{3}{11}\) - \(\dfrac{2}{7}\)
= - \(\dfrac{21}{77}\) - \(\dfrac{22}{77}\)
= - \(\dfrac{43}{77}\)
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20 * 21 * 22 * 23 * 24 * 25 * 26 * 27 * 28 * 29 * 30 * 31 * 32 * 33 * 34 * 35 * 36 * 37 * 38 * 39 * 40 * 41 * 42 * 43 * 44 * 45 * 46 * 47 * 48 * 49 * 50 * 51 * 52 * 53 * 54 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
212 . 35 - 46 . 92 510 . 73 - 255 . 492
______________ - ____________________
(22 . 3)6 (125 . 7)3 + 59 . 143
\(=\dfrac{2^{12}\cdot3^4\left(3-1\right)}{2^{12}\cdot3^6}-\dfrac{5^{10}\cdot7^3\left(1-7\right)}{5^9\cdot7^3+5^9\cdot7^3\cdot2^3}\)
\(=\dfrac{-2}{9}-\dfrac{5\cdot\left(-6\right)}{9}=\dfrac{-2-5\cdot\left(-6\right)}{9}=\dfrac{-2+30}{9}=\dfrac{28}{9}\)
rút gọn
P= \((\dfrac{1-a\sqrt{a}}{1-\sqrt{a}}+\sqrt{a}).(\dfrac{1-\sqrt{a}}{1-a})^2\)
Với \(\left\{{}\begin{matrix}a\ge0\\a\ne1\end{matrix}\right.\)
\(P=\left(\dfrac{1-a\sqrt{a}}{1-\sqrt{a}}+\sqrt{a}\right).\left(\dfrac{1-\sqrt{a}}{1-a}\right)^2\\ =\left(\dfrac{\left(1-\sqrt{a}\right)\left(1+\sqrt{a}+a\right)}{1-\sqrt{a}}+\sqrt{a}\right).\left(\dfrac{1-\sqrt{a}}{\left(1+\sqrt{a}\right)\left(1-\sqrt{a}\right)}\right)^2\\ =\left(1+\sqrt{a}+a+\sqrt{a}\right)\left(\dfrac{1}{1+\sqrt{a}}\right)^2\\ =\left[\left(1+\sqrt{a}\right)+\sqrt{a}\left(\sqrt{a}+1\right)\right]\left(\dfrac{1}{1+\sqrt{a}}\right)^2\\ =\dfrac{\left(1+\sqrt{a}\right)\left(1+\sqrt{a}\right).1^2}{\left(1+\sqrt{a}\right)^2}=1\)
a.1344 : 24 b. 432 : 36 c. 10395 : 231 d. 28624 : 212 e.16884 : 126
9108 : 36 9450 : 35 68044 : 315 37100 : 212 38481 : 127
899 : 29 17825 : 67 28905 : 123 42927 : 349 44604 : 236
làm đc hết tui tích đúng nheeeee
tách ra từng câu 1 chứ thế này thì chịu :)
a: 1344:24=56
b: 432:36=11
c: 10395:231=45
d: 28624:212=135(dư 1)
e: 16884:126=134
f: 9108:36=253