bạn nào đó giúp mình với. CẦN GẤP.
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a: M(x)=x^4+4,5x^2+2x-15
N(x)=4x^4+x^2+4
b: M(x)+N(x)=5x^4+5,5x^2+2x-11
M(x)-N(x)=-3x^4+3,5x^2+2x-19
c: N(x)=x^2(4x^2+1)+4>0
=>N(x) ko có nghiệm
a,\(\dfrac{2}{3}\)-\(\dfrac{5}{7}\).\(\dfrac{14}{25}\)
=\(\dfrac{2}{3}\)-\(\dfrac{2}{5}\)
=\(\dfrac{4}{15}\)
b,\(\dfrac{-2}{5}\).\(\dfrac{5}{8}\)+\(\dfrac{5}{8}\).\(\dfrac{3}{5}\)
=\(\dfrac{5}{8}\).(\(\dfrac{-2}{5}\)+\(\dfrac{3}{5}\))
=\(\dfrac{5}{8}\).\(\dfrac{1}{5}\)
=\(\dfrac{1}{8}\)
Giải:
a) \(\dfrac{2}{3}-\dfrac{5}{7}.\dfrac{14}{25}=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{4}{15}\)
b) \(\dfrac{-2}{5}.\dfrac{5}{8}+\dfrac{5}{8}.\dfrac{3}{5}\)
\(=\dfrac{5}{8}.\left(\dfrac{-2}{5}+\dfrac{3}{5}\right)\)
\(=\dfrac{5}{8}.\dfrac{1}{5}\)
\(=\dfrac{1}{8}\)
c) \(\left(\dfrac{1}{2}\right)^2-1\dfrac{1}{2}+0,5.\dfrac{12}{5}+5\%\)
\(=\dfrac{1}{4}-\dfrac{3}{2}+\dfrac{1}{2}.\dfrac{12}{5}+\dfrac{1}{20}\)
\(=\dfrac{-5}{4}+\dfrac{6}{5}+\dfrac{1}{20}\)
\(=0\)
Chúc bạn học tốt!
bạn giúp mình phần tự luận đi phần trắc nghiệm mình làm rồi bạn giúp mình nha mai mình thi rồi
1 Ann is very upset because the local authorities have turned down her proposals to install solar panels to supply electricity for traffic lights
2 A committe has been set up to examine the question
3 Our class football team lost the match, so we tried to cheer them up
4 "Can I wear jeans at wedding party?" - "Of course not. You'll have to cover up smart clothes"
5 Before I come to a decision, I'll have to think over their offer very carefullyAnn is very upset because the local authorities have turned down her proposals to install solar panels to supply electricity for traffic lights
A committe has been set up to examine the question
Our class football team lost the match, so we tried to spirit them up /cheer them up
"Can I wear jeans at wedding party?" - "Of course not. You'll have to cover up smart clothes"
Before I come to a decision, I'll have to think over their offer very carefully
đừng gian lận nha bạn
nguyễn gia hân ko phải mình đang lm đề ôn tập nhưng khó qqu