Tính nhanh :
a ) \(\left(\frac{2}{5}+\frac{2}{7}-\frac{2}{11}\right):\left(\frac{3}{7}-\frac{3}{11}+\frac{3}{5}\right)\)
b) \(\frac{0,125-\frac{1}{5}+\frac{1}{7}}{0,375-\frac{3}{5}+\frac{3}{7}}+\frac{\frac{1}{2}+\frac{1}{3}-0,2}{\frac{3}{4}+0,5-\frac{3}{10}}\)
tính bằng cách hợp lí:
a) \(\frac{1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}}{1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}}:\frac{13+\frac{13}{2}+\frac{13}{3}+\frac{13}{4}}{17-\frac{17}{2}+\frac{17}{3}-\frac{17}{4}}\)
b)\(\frac{0,125-\frac{1}{5}+\frac{1}{7}}{0,375-\frac{3}{5}+\frac{3}{7}}+\frac{\frac{1}{2}+\frac{1}{3}-0,2}{\frac{3}{4}+0,5-\frac{3}{10}}\)
giải hộ mk vs nhé (giải chí tiết hộ mk nhá)
1) Tính :
a) 2/5 + 2/7 - 2/11 / 3/5 + 3/7 - 3/11 + 1/4 - 1/5 + 1/7 / 3/4 - 3/5 + 3/7
b) 0,125 - 1/5 + 1/7 / 0,375 - 3/5 + 3/7 + 1/2 + 1/3 - 0,3 / 3/9 + 0,5 - 3/10
Tính:
a) (1/7)^7 .7^7
b) (0,125)^3 .512
c) (0,25)^4 .1024
d) 90^3/15^3
e) 3^2/0,375^2
f) 3^2 .1/234 .81^2 .1/3^3
g) (4.2^5) : (2^3 .1/16)
h) (2^-1 + 3^-1) : (2^-1 - 3^-1) + (2^-1 .2^0) : 2^3
i) (-1/3)^-1 - (-6/7)^9 + (1/2)^2 : 2
Cách giải chi tiết.
tính
2,\(A=\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{-0,625+0,5-\frac{5}{11}-\frac{5}{12}}+\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
3,\(B=\frac{\frac{1}{3}-\frac{1}{7}-\frac{1}{13}}{\frac{2}{3}-\frac{2}{7}-\frac{2}{13}}.\frac{\frac{1}{3}-0,25+0,2}{1\frac{1}{6}-0,875+0,7}+\frac{6}{7}\)
Bài 1:
1) \(\frac{\left(13\frac{1}{4}-2\frac{5}{27}-10\frac{5}{6}\right).230\frac{1}{25}+46\frac{3}{4}}{\left(1\frac{3}{7}+\frac{10}{3}\right):\left(12\frac{1}{3}-14\frac{2}{7}\right)}\)
2) \(\frac{0,375-0,3+\frac{3}{11}-\frac{3}{17}}{0,625-0,5+\frac{5}{11}-\frac{5}{17}}+\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
Tính:1)A=\(\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{-0,625+0,5-\frac{5}{11}-\frac{5}{12}}+\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
B=\(\frac{\frac{1}{3}-\frac{1}{7}-\frac{1}{13}}{\frac{2}{3}-\frac{2}{7}-\frac{2}{13}}\times\frac{\frac{1}{3}-0,25+0,2}{1\frac{1}{6}-0,875+0,7}+\frac{6}{7}\)
Bài 1: Tính
a) -7/9 . 2/3/4 (2/3/4 là hỗn số : 2 là số nguyên, 3/4 là phân số)
b) 2/3 + 1/3 . (-2/5)
c) 3/4 . 15/1/3 - 3/4 . 43/1/3
d) (-49,1) . 13/27 - 58,9 . 13/27
e) 0,375 : (-4,5)
f) 3/1/7 : (-1/3/7)
g) 9/1/3 : 4/2/3 - 2
h) (7/3/4 : 0,3125 + 4,5 . 2/2/45) : (-8,5)
Bài 2: Tính giá trị biểu thức
A = (-6/11) . 7/10 . (11/-6).(-20)
B = (-1/9) . (-17/29) . 58/51
C = (-3/7) . 5/11 + (-5/14) . 5/11
D = (1/1/27 . 12/23 . 9/14) : (-3/23)
Bài 3: Tìm x
a) 3/7 . x - 2/5 . x = -17/35
b) (3/4 . x -9/16) . [1/3 + (-3/5) : x] = 0
c) (x + 3/5) . (x + 1) = 0
Bài 1:
a) (-0,25) . 0,45 . 0,4 . (-0,125) . 0,55 . (-8)
b) [ 20,83 . 0,2 + (-9,17 . 0,2) ] : [ 2,47 . 0,5 - (-3,53 . 0,5) ]
c) \(\frac{(9\frac{3}{4}\div5,2+3,4\times2\frac{7}{34})\div(-1\frac{9}{16})}{\left(-0,31\right).8\frac{2}{5}-5,61\div\left(-27\frac{1}{2}\right)}\)