2 và 3/4 x (-0.4) - 1 và 3/5 x 2,75+ (-1,2):4/11
Thực hiện phép tính sao cho hợp lí nhất:
a)\(2\frac{3}{4}.\left(-0.4\right)-1\frac{3}{5}.2,75+1,2:\frac{4}{11}\)
b)\(\left(\frac{1}{2}+1\right).\left(\frac{1}{3}+1\right).\left(\frac{1}{4}+1\right).....\left(\frac{1}{31}+1\right)\)
c)\(\frac{930}{1+2+3+....+30}\)
Tính:\(B=2\frac{3}{4}.\left(-0,4\right)-1\frac{3}{5}.2,75+\left(-1,2\right):\frac{4}{11}\)
Giúp mk vs !!!
Bài 1. Tính giá trị các biểu thức sau:
A = -1,7 . 2,3 + 1,7 . (-3,7) - 1,7 . 3 - 0,17 : 0,1
B = \(2\dfrac{3}{4}.\left(-0,4\right)-1\dfrac{2}{3}.2,75+\left(-1,2\right):\dfrac{4}{11}\)
C = \(\dfrac{\left(2^3.5.7\right)\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
a,\(\frac{0,75-0,6+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+\frac{11}{7}+\frac{11}{13}}\)
b,\(\frac{5}{9}:\left(\frac{1}{3}+\frac{1}{4}\right)+\frac{5}{9}:\left(\frac{1}{9}+\frac{2}{3}\right)\)
giup minh voi!!!!
Tính
a) \(\frac{-1}{7}.\left(9\frac{1}{2}-8,75\right):\frac{2}{7}+0,625:1\frac{2}{3}\)
b)x-25%.x-1=-|-5|
c)\(2\frac{3}{4}.\left(0,4\right)1\frac{3}{5}.2,75+\left(-1,2\right):\frac{4}{11}\)
d) (2,8 x -32 ):\(\frac{2}{3}=-90\)
Tìm x\((\frac{1}{8}+2\frac{5}{4}-2,75)x-7=(\frac{3}{2}+0,65+\frac{7}{200}):0,07\)
tính nhanh
\(2\frac{3}{4}.\left(-0,4\right)-1\frac{3}{5}.2,75+1,2:\frac{4}{11}\)
D= 2 3/4 . ( -0,4) - 1 3/5 . 2,75 + ( -1,2) : 4/11
E= (23 . 5 . 7 ) . ( 52 . 73)
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( 2 .5 .72 ) 2
- So sánh biểu thức:
A= 2000/ 2001 + 2001/2002
B= 2000+2001/ 2001+2002
a/ 1 13/5 . ( 0,5)2 . 3 + ( 8/5 - 1 19/60) : 1 23/24
b/ 112 / 200 + 0,415) : 0,01
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1/2 - 37,25 + 3 1/6