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 ):\(\frac{2}{3}=-90\)
Tính:\(B=2\frac{3}{4}.\left(-0,4\right)-1\frac{3}{5}.2,75+\left(-1,2\right):\frac{4}{11}\)
tính nhanh
\(2\frac{3}{4}.\left(-0,4\right)-1\frac{3}{5}.2,75+1,2:\frac{4}{11}\)
2 và 3/4 x (-0.4) - 1 và 3/5 x 2,75+ (-1,2):4/11
Tính:
\(2\frac{2}{4}.\left(-0.4\right)-1\frac{2}{3}.2,75+1,2\div\frac{4}{11}\)
Tính:
A = 2\(\frac{3}{4}\). (--0,4) - 1\(\frac{3}{5}\).2,75 + (-1,2) : \(\frac{4}{11}\)
1. C = -1,7 x 2,3 + 1,7 x (-3,7) - 1,7 x 3 - 0,17 : 0,1
D = \(2\frac{3}{4}\) x (-0,4) - \(1\frac{3}{5}\) x 2,75 + (-1,2) :\(\frac{4}{11}\)
E = \(\frac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
2.
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)\(\frac{930}{1+2+3+....+30}\)
Tìm x\((\frac{1}{8}+2\frac{5}{4}-2,75)x-7=(\frac{3}{2}+0,65+\frac{7}{200}):0,07\)
