Đại số lớp 7
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27 Tính
A= \(\dfrac{10\dfrac{1}{3}.(26\dfrac{1}{3}-\dfrac{176}{7})-\dfrac{12}{11}.(\dfrac{10}{3}-1,75}{(\dfrac{5}{91-0,25)}.\dfrac{60}{11}-1}\)
1. Tìm tỉ số dfrac{x}{y} biết dfrac{2x-y}{x+y}dfrac{2}{3}
2. Tìm x:
a) 3,8 : (2x) dfrac{1}{4}:2dfrac{2}{3}
b) 1dfrac{1}{3} : 0,8 dfrac{2}{3} : (0,1x)
c) dfrac{x}{-15} dfrac{-60}{x}
d) dfrac{-2}{x}dfrac{-x}{dfrac{8}{25}}
e) 0,2 : 1dfrac{1}{5} dfrac{2}{3} : (6x+7)
3. Tính A dfrac{8^{10}+4^{10}}{8^4+4^{11}}
Đọc tiếp
1. Tìm tỉ số \(\dfrac{x}{y}\) biết \(\dfrac{2x-y}{x+y}\)=\(\dfrac{2}{3}\)
2. Tìm x:
a) 3,8 : (2x) = \(\dfrac{1}{4}:2\dfrac{2}{3}\)
b) \(1\dfrac{1}{3}\) : 0,8 = \(\dfrac{2}{3}\) : (0,1x)
c) \(\dfrac{x}{-15}\) = \(\dfrac{-60}{x}\)
d) \(\dfrac{-2}{x}=\dfrac{-x}{\dfrac{8}{25}}\)
e) 0,2 : \(1\dfrac{1}{5}\)= \(\dfrac{2}{3}\) : (6x+7)
3. Tính A = \(\dfrac{8^{10}+4^{10}}{8^4+4^{11}}\)
tìm x :
a) dfrac{x+1}{7}+dfrac{x+1}{8}dfrac{x+1}{9}+dfrac{x+1}{10}
b) dfrac{x+1}{12}+dfrac{x^2}{11}dfrac{x+3}{10}+dfrac{x+4}{9}
c) dfrac{x-2}{x-1}dfrac{x+4}{x+7}
d)dfrac{3x+2}{5x+7}dfrac{3x-1}{5x-3}
2 tìm x,y,z
a) dfrac{x}{2}dfrac{y}{3},dfrac{y}{4}dfrac{z}{5}vàx^2-y^2-16
b)2x3y,5x7z và 3x-7y+5z30
Đọc tiếp
tìm x :
a) \(\dfrac{x+1}{7}+\dfrac{x+1}{8}=\dfrac{x+1}{9}+\dfrac{x+1}{10}\)
b) \(\dfrac{x+1}{12}+\dfrac{x^2}{11}=\dfrac{x+3}{10}+\dfrac{x+4}{9}\)
c) \(\dfrac{x-2}{x-1}=\dfrac{x+4}{x+7}\)
d)\(\dfrac{3x+2}{5x+7}=\dfrac{3x-1}{5x-3}\)
2 tìm x,y,z
a) \(\dfrac{x}{2}=\dfrac{y}{3},\dfrac{y}{4}=\dfrac{z}{5}vàx^2-y^2=-16\)
b)2x=3y,5x=7z và 3x-7y+5z=30
5. \(3-1\dfrac{1}{2}-x+\dfrac{5}{4}=2-\left|1\dfrac{1}{8}-\dfrac{5}{12}\right|\) 6. \(3\dfrac{1}{14}-5\dfrac{1}{3}-\dfrac{4}{7}+\dfrac{11}{21}=-\dfrac{1}{2}\) 7. \(\dfrac{11}{-40}+\dfrac{4}{5}-\left|\dfrac{3}{4}-1\dfrac{5}{12}\right|=\dfrac{3}{20}-X\)
Tính :
A = \(\dfrac{\dfrac{3}{7}-\dfrac{3}{11}+\dfrac{3}{13}}{\dfrac{5}{7}-\dfrac{5}{11}+\dfrac{5}{13}}+\dfrac{\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{4}}{\dfrac{5}{4}-\dfrac{5}{6}+\dfrac{5}{3}}\)
Câu 1)1) dfrac{11}{24}−dfrac{5}{41}+dfrac{13}{24}+0,5−dfrac{36}{41}2)12÷left(dfrac{3}{4}-dfrac{5}{6}right)^23) (1+dfrac{2}{3}-dfrac{1}{4})left(0,8-dfrac{3}{4}right)^2 4)16dfrac{2}{7}÷(dfrac{-3}{5})+28dfrac{2}{7}÷dfrac{3}{5}5)left(2^2divdfrac{4}{3}-dfrac{1}{2}right)timesdfrac{6}{5}-176)left(dfrac{1}{3}right)^{50}timesleft(-9right)^{25}-dfrac{2}{3}div4
Đọc tiếp
Câu 1)
1) \(\dfrac{11}{24}\)−\(\dfrac{5}{41}\)+\(\dfrac{13}{24}\)+0,5−\(\dfrac{36}{41}\)=
2)12÷\(\left(\dfrac{3}{4}-\dfrac{5}{6}\right)^2\)=
3) (\(1+\dfrac{2}{3}-\dfrac{1}{4}\))\(\left(0,8-\dfrac{3}{4}\right)^2\) =
4)\(16\dfrac{2}{7}\)÷(\(\dfrac{-3}{5}\))+\(28\dfrac{2}{7}\)÷\(\dfrac{3}{5}\)
5)\(\left(2^2\div\dfrac{4}{3}-\dfrac{1}{2}\right)\times\dfrac{6}{5}-17\)
6)\(\left(\dfrac{1}{3}\right)^{50}\times\left(-9\right)^{25}-\dfrac{2}{3}\div4\)
5. \(3-1\dfrac{1}{2}-x+\dfrac{5}{4}=2-\left|1\dfrac{1}{8}-\dfrac{5}{12}\right|\) 6. \(3\dfrac{1}{14}-5\dfrac{1}{3}-\dfrac{4}{7}+\dfrac{11}{21}=x-\dfrac{1}{2}\) 7. \(\dfrac{11}{-40}+\dfrac{4}{5}-\left|\dfrac{3}{4}-1\dfrac{5}{12}\right|=\dfrac{3}{20}-x\)
Tính biểu thức A=\(\dfrac{\dfrac{3}{4}-\dfrac{3}{11}+\dfrac{3}{13}}{\dfrac{5}{7}-\dfrac{5}{11}+\dfrac{5}{13}}+\dfrac{\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{4}}{\dfrac{5}{4}-\dfrac{5}{6}+\dfrac{5}{8}}\)
1. Tính:
a. dfrac{-1}{4}+dfrac{5}{6} b. dfrac{5}{12}+dfrac{-7}{8} c. dfrac{-7}{6}+dfrac{-3}{10} d. dfrac{-3}{7}+dfrac{5}{6}
2. Tính :
a. dfrac{2}{14}-dfrac{5}{2} b. dfrac{-13}{12}-dfrac{5}{18} c. dfrac{-2}{5}-dfrac{-3}{11} d. 0,6--1dfrac{2}{3}
3. Tính :
a. dfrac{-1}{39}+dfrac{-1}{52} b. dfr...
Đọc tiếp
1. Tính:
a. \(\dfrac{-1}{4}+\dfrac{5}{6}\) b. \(\dfrac{5}{12}+\dfrac{-7}{8}\) c. \(\dfrac{-7}{6}+\dfrac{-3}{10}\) d. \(\dfrac{-3}{7}+\dfrac{5}{6}\)
2. Tính :
a. \(\dfrac{2}{14}-\dfrac{5}{2}\) b. \(\dfrac{-13}{12}-\dfrac{5}{18}\) c. \(\dfrac{-2}{5}-\dfrac{-3}{11}\) d. \(0,6--1\dfrac{2}{3}\)
3. Tính :
a. \(\dfrac{-1}{39}+\dfrac{-1}{52}\) b. \(\dfrac{-6}{9}-\dfrac{12}{16}\) c. \(\dfrac{-3}{7}-\dfrac{-2}{11}\) d.\(\dfrac{1}{1.2}+\dfrac{1}{2.3}+\dfrac{1}{3.4}+...+\dfrac{1}{8.9}+\dfrac{1}{9.10}\)