15*14-1/13*15+15
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a,=\(\dfrac{8}{14}-\dfrac{1}{14}+\dfrac{5}{21}+\dfrac{3}{2}\)
=\(\dfrac{1}{2}+\dfrac{3}{2}+\dfrac{5}{21}\) =\(2+\dfrac{5}{21}\) =\(\dfrac{42}{21}+\dfrac{5}{21}\) =\(\dfrac{47}{21}\)
b,=\(\dfrac{11}{13}.\dfrac{12}{15}-\dfrac{7}{15}+\dfrac{14}{15}.\dfrac{11}{13}\)
=\(\dfrac{11}{13}.\left(\dfrac{12}{15}+\dfrac{14}{15}\right)-\dfrac{7}{15}\)
=\(\dfrac{11}{13}.\dfrac{26}{15}-\dfrac{17}{15}\) =\(\dfrac{22}{15}-\dfrac{17}{15}\) =\(\dfrac{5}{15}\) =\(\dfrac{1}{3}\)
c,=\(\left(\dfrac{3}{6}-\dfrac{2}{6}\right)^2\) =\(\left(\dfrac{1}{6}\right)^2\) =\(\dfrac{1}{36}\)
d,=câu này dễ mà
A)\(\frac{14.15-1}{13.15+14}=\frac{210-1}{195+14}=\frac{200}{209}\)
\(\frac{14x15-1}{13x15+14}\)
\(=\frac{13x15+15-1}{13x15+14}\)
\(=\frac{13x15+14}{13x15+14}=1\)
`@` `\text {Ans}`
`\downarrow`
`M = (-15)+(-14)+(-13)+(-12)+...+14+15`
`= (-15+15) + (-14+14) + (-13+13) + ... (-1 + 1) + 0`
`= 0`
đáp án : 2910/13
15 x 14 - \(\frac{1}{3}\)x 13 x 15 + 15
= 210 - \(\frac{1}{3}\)x 13 x 15 + 15
= \(\frac{629}{3}\)x 13 x 15 + 15
= \(\frac{8177}{3}\)x 15 + 15
= 40885 + 15
= 40900