\(\dfrac{1}{4}x+2x=3\dfrac{1}{2}-1,5\)
\(\dfrac{9}{4}x=6-1,5\)
\(\dfrac{9}{4}x=\dfrac{9}{2}\)
\(x=\dfrac{9}{2}:\dfrac{9}{4}=2\)
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Bài 1. Tính giá trị biểu thức
125%.(dfrac{-1}{2})^2:(1dfrac{5}{16}-1,5)+2008^0
dfrac{2}{3.5}+dfrac{2}{5.3}+dfrac{2}{7.9}+dfrac{2}{9.11}+dfrac{2}{11.13}+dfrac{2}{13.15}
Bài 2. Tìm x, biết
x:3dfrac{1}{15}1dfrac{1}{12}
dfrac{3}{4}.x27
x.dfrac{1}{4}dfrac{5}{8}.dfrac{2}{3}
left(x+dfrac{1}{4}right):dfrac{3}{7}dfrac{1}{6}
dfrac{3}{4}-2.|2x-dfrac{2}{3}|2
dfrac{2}{3}x-dfrac{1}{2}xdfrac{5}{2}
Đọc tiếp
Bài 1. Tính giá trị biểu thức
125%.\((\dfrac{-1}{2})^2\):\((1\dfrac{5}{16}-1,5)+2008^0\)
\(\dfrac{2}{3.5}+\dfrac{2}{5.3}+\dfrac{2}{7.9}+\dfrac{2}{9.11}+\dfrac{2}{11.13}+\dfrac{2}{13.15}\)
Bài 2. Tìm x, biết
x:\(3\dfrac{1}{15}=1\dfrac{1}{12}\)
\(\dfrac{3}{4}.x=27\)
\(x.\dfrac{1}{4}=\dfrac{5}{8}.\dfrac{2}{3}\)
\(\left(x+\dfrac{1}{4}\right):\dfrac{3}{7}=\dfrac{1}{6}\)
\(\dfrac{3}{4}-2.|2x-\dfrac{2}{3}|=2\)
\(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{2}\)
Bài 1 : Tìm x
a) 4dfrac{1}{2}x : dfrac{5}{12}0,5 b)1,5+1dfrac{1}{4}.x dfrac{2}{3} c) 7,5.1dfrac{3}{4}6dfrac{2}{5} d)(x - 5):dfrac{1}{3}dfrac{2}{5} e) (4,5-2x):dfrac{3}{4}1dfrac{1}{3} f) (2,7x - 1dfrac{1}{2}x) : dfrac{2}{7}dfrac{-21}{7}
Bài 2 : tìm a,b biết
dfrac{a}{27}dfrac{-5}{9}dfrac{-45}{b}
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Bài 1 : Tìm x
a) 4\(\dfrac{1}{2}\)x : \(\dfrac{5}{12}\)=0,5 b)1,5+1\(\dfrac{1}{4}\).x= \(\dfrac{2}{3}\) c) 7,5.1\(\dfrac{3}{4}\)=\(6\dfrac{2}{5}\) d)(x - 5):\(\dfrac{1}{3}\)=\(\dfrac{2}{5}\) e) (4,5-2x):\(\dfrac{3}{4}\)=1\(\dfrac{1}{3}\) f) (2,7x - 1\(\dfrac{1}{2}\)x) : \(\dfrac{2}{7}=\dfrac{-21}{7}\)
Bài 2 : tìm a,b biết
\(\dfrac{a}{27}=\dfrac{-5}{9}=\dfrac{-45}{b}\)
tính:
dfrac{2}{5}xdfrac{1}{3}-dfrac{2}{15}:dfrac{1}{5}+dfrac{3}{5}xdfrac{1}{3}
2)left(3dfrac{1}{3}+2,5right):left(3dfrac{1}{6}-4dfrac{1}{5}right)-dfrac{11}{31}
3)left[6+left(dfrac{1}{2^{ }}right)^3-left|-dfrac{1}{2}right|right]:dfrac{3}{12}
4)dfrac{18}{37}+dfrac{8}{24}+dfrac{19}{37}-1dfrac{23}{24}+dfrac{2}{3}
5) left(-2right)^3xleft(dfrac{3}{4}-0,25right):left(2dfrac{1}{4}-1dfrac{1}{6}right)
6)left(dfrac{2}{5}right)^2+5dfrac{1}{2}xleft(45-2right)+dfrac{23}{-4}
7)dfrac{4}{9}-19dfrac{1}{3}-...
Đọc tiếp
tính:
\(\dfrac{2}{5}x\dfrac{1}{3}-\dfrac{2}{15}:\dfrac{1}{5}+\dfrac{3}{5}x\dfrac{1}{3}\)
2)\(\left(3\dfrac{1}{3}+2,5\right):\left(3\dfrac{1}{6}-4\dfrac{1}{5}\right)-\dfrac{11}{31}\)
3)\(\left[6+\left(\dfrac{1}{2^{ }}\right)^3-\left|-\dfrac{1}{2}\right|\right]:\dfrac{3}{12}\)
4)\(\dfrac{18}{37}+\dfrac{8}{24}+\dfrac{19}{37}-1\dfrac{23}{24}+\dfrac{2}{3}\)
5) \(\left(-2\right)^3x\left(\dfrac{3}{4}-0,25\right):\left(2\dfrac{1}{4}-1\dfrac{1}{6}\right)\)
6)\(\left(\dfrac{2}{5}\right)^2+5\dfrac{1}{2}x\left(45-2\right)+\dfrac{23}{-4}\)
7)\(\dfrac{4}{9}-19\dfrac{1}{3}-\dfrac{4}{9}x39\dfrac{1}{3}\)
8)\(\left(-\dfrac{1}{2}\right)^2:\dfrac{1}{4}-2x\left(-\dfrac{1}{2}\right)^2\)
9)\(125\%x\left(-\dfrac{1}{2}\right)^3:\left(1\dfrac{5}{16}-1,5\right)+2008^0\)
giúp mình nha mai mình học rùi 
10,07 - [3,927 - (3,63 - \(\dfrac{2}{20}\)) ] < (hoặc bằng) x < (hoặc bằng) 1,5 . (9,2 - \(\dfrac{2}{5}\)) + (3,2 - 3,12) . (4\(\dfrac{1}{10}\) - 2,85)
(x+2,5):\(2\dfrac{1}{2}-1,5=-1\dfrac{1}{4}\)
giúp mình với
BT2: Tìm x, biết
1) \(x-\dfrac{1}{2}=\dfrac{1}{3}+\dfrac{-1}{4}\)
2) \(x+\dfrac{1}{3}=\dfrac{1}{2}-\dfrac{1}{4}\)
Tìm x, biết:
1. left(dfrac{2x}{5}+2right):left(-4right)-1dfrac{1}{2}
2. x. ( x + 1) 0
3. 2x - 16 40 + x
4. x : dfrac{5}{3} + dfrac{1}{3} dfrac{-2}{5}
5. 3dfrac{1}{2} - dfrac{1}{2} x dfrac{2}{3}
6. dfrac{x}{4}dfrac{9}{x}
7. dfrac{1}{3}+dfrac{1}{2}:x -0,25
Đọc tiếp
Tìm x, biết:
1. \(\left(\dfrac{2x}{5}+2\right):\left(-4\right)=-1\dfrac{1}{2}\)
2. x. ( x + 1) = 0
3. 2x - 16 = 40 + x
4. x : \(\dfrac{5}{3}\) + \(\dfrac{1}{3}\) = \(\dfrac{-2}{5}\)
5. 3\(\dfrac{1}{2}\) - \(\dfrac{1}{2}\) x = \(\dfrac{2}{3}\)
6. \(\dfrac{x}{4}=\dfrac{9}{x}\)
7. \(\dfrac{1}{3}+\dfrac{1}{2}:x=\) -0,25
1: rút gọn rồi tính
left(-dfrac{72}{40}-dfrac{144}{60}-2dfrac{1}{3}right) : left(dfrac{45}{100}-dfrac{25}{60}+-dfrac{75}{25}right)
2: tìm x: 3cdotleft(4-xright)+left(x+2right)cdotleft(1+2xright)7cdotleft(1+xright)-2xcdotleft(2-xright)
3: tìm x: dfrac{2cdotleft(1+xright)}{3}-dfrac{5cdotleft(2-xright)}{6}1dfrac{1}{3}-dfrac{3cdotleft(2x+3right)}{4}-1dfrac{1}{2}cdotleft(x+1right)
4: cho a 3+3^{2^3}+3^3+3^4+...+3^{360}
Đọc tiếp
1: rút gọn rồi tính
\(\left(-\dfrac{72}{40}-\dfrac{144}{60}-2\dfrac{1}{3}\right)\) : \(\left(\dfrac{45}{100}-\dfrac{25}{60}+-\dfrac{75}{25}\right)\)
2: tìm x: \(3\cdot\left(4-x\right)+\left(x+2\right)\cdot\left(1+2x\right)=7\cdot\left(1+x\right)-2x\cdot\left(2-x\right)\)
3: tìm x: \(\dfrac{2\cdot\left(1+x\right)}{3}-\dfrac{5\cdot\left(2-x\right)}{6}=1\dfrac{1}{3}-\dfrac{3\cdot\left(2x+3\right)}{4}-1\dfrac{1}{2}\cdot\left(x+1\right)\)
4: cho a= \(3+3^{2^3}+3^3+3^4+...+3^{360}\)
a)x=\(\dfrac{1}{4}+\dfrac{2}{13}\)
b)\(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)
c)\(\dfrac{-8}{3}+\dfrac{-1}{3}\le x\le\dfrac{-2}{7}+\dfrac{-5}{7}\)
d)\(\dfrac{-5}{6}+\dfrac{8}{3}\dfrac{29}{-x}\le x\le\dfrac{-1}{2}+2+\dfrac{5}{2}\)