Thực hiện phép tính:
\(2:\frac{1}{2}\)
ai tick mk mk tick lại!
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\(-\frac{9991}{9992}+\frac{1}{99}-\frac{2}{19984}-\frac{5}{495}\)
\(=-\frac{9991}{9992}+\frac{1}{99}-\frac{1}{9992}-\frac{1}{99}\)
\(=\left(-\frac{9991}{9992}-\frac{1}{9992}\right)+\left(\frac{1}{99}-\frac{1}{99}\right)\)
\(=-1+0\)
\(=-1\)
\(\frac{-1}{-16}-\frac{1}{15}\)
\(=\frac{1}{16}-\frac{1}{15}\)
\(=\frac{15-16}{16\times15}\)
\(=\frac{-1}{240}\)
\(-\frac{1}{16}-\frac{1}{15}\)
\(=-\left(\frac{1}{16}+\frac{1}{15}\right)\)
\(=-\frac{16+15}{16\times15}\)
\(=-\frac{31}{240}\)
25-[50-(2^3.17-2^3.14)]
=25-[50-(8.17-8.14)]
=25-[50-(136-112)]
=25-[50-24]
=25-26
=-1
|-128|: [45^2-(2010-2008.1^2010)]
=128:[45^2-(2010-2008.1)]
=128:[45^2-(2010-2008)]
=128:[45^2-2]
=128:[2025-2]
=128:2023
=0,063 (chắc mik làm sai b đấy :( )
25-[50-(2^3.17-2^3.14)]=25-{50-[2^3.(17-14)]}
=25-{50-[8.3]}
=25-{50-24}
\(=\left[\frac{2xy}{\left(x-y\right).\left(x+y\right)}+\frac{x-y}{2.\left(x+y\right)}\right]:\frac{x+y}{2x}+\frac{x}{y-x}\)
\(=\frac{4xy+\left(x-y\right).\left(x-y\right)}{2.\left(x-y\right).\left(x+y\right)}.\frac{2x}{x+y}+\frac{x}{y-x}\)
\(=\frac{x^2+2xy+y^2}{\left(x-y\right).\left(x+y\right)^2}.x+\frac{x}{y-x}\)
\(=\frac{x.\left(x+y\right)^2}{\left(x-y\right).\left(x+y\right)^2}+\frac{x}{y-x}\)
\(=\frac{x}{x-y}-\frac{x}{x-y}=0\)
Bạn giùm mik nhé, tks bạn nhiều (:
Số cần tìm là:
\(\frac{5}{1}+\frac{2}{1}\) = \(\frac{7}{1}\)
Đáp số: \(\frac{7}{1}\)
M=20/112+20/280+20/520+20/832
M=20/8.14+20/14.20+20/26.20+20/26.32
M=20/6.(6/8.14+6/14.20+6/20.26+6/26.32)
M=20/6.(1/8-1/14+1/14-1/20+1/20-1/26+1/26-1/32)
M=20/6.(1/8-1/32)
M=20/6.3/32
M=5/16
\(M=\frac{20}{112}+\frac{20}{280}+\frac{20}{520}+\frac{20}{832}\)
\(M=\frac{20}{8.14}+\frac{20}{14.20}+\frac{20}{20.26}+\frac{20}{26.32}\)
\(M=\frac{20}{6}\left(\frac{6}{8.14}+\frac{6}{14.20}+\frac{6}{20.26}+\frac{6}{26.32}\right)\)
\(M=\frac{10}{3}.\left(\frac{1}{8}-\frac{1}{14}+\frac{1}{14}-\frac{1}{20}+\frac{1}{20}-\frac{1}{26}+\frac{1}{26}-\frac{1}{32}\right)\)
\(M=\frac{10}{3}.\left(\frac{1}{8}-\frac{1}{32}\right)\)
\(M=\frac{10}{3}.\left(\frac{4}{32}-\frac{1}{32}\right)\)
\(M=\frac{10}{3}.\frac{3}{32}\)
\(M=\frac{5}{16}\)
Chúc bạn học tốt !!!!
Thực hiện phép tính:
2 : 1/2 = 4
tích mik nha
=4
ai k mk mk
lại cho ng đó !