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\(a/\) \(\left(-77\right)+27=\left(-50\right)\)
\(b/\left(-146\right)+\left(-54\right)=\left(-200\right)\)
\(c/-\left(19-82\right)+\left(98-82\right)\)
\(=-\left(-63\right)+16\)
\(=\left(-47\right)\)
\(d/\left|-6\right|+\left(-7\right)+\left|-4\right|+\left(-3\right)\)
\(=6+\left(-7\right)+4+\left(-3\right)\)
\(=6+4-7-3=0\)
\(e/\left(-17\right)+5+8+17+\left(-3\right)\)
\(=\left(-17\right)+17+13-3\)
\(=0+10=10\)
\(f/25\cdot2^2-\left(15-18\right)+\left(12-19+10\right)\)
\(=25\cdot4-\left(-3\right)+3\)
\(=100+3+3=106\)
\(g/15^2-\left(15+9\right):2^2+3\cdot\left(4^2\right)+1\)
\(=225-24:4+3\cdot\left(16+1\right)\)
\(=225-6+3\cdot17\)
\(=219+51\)
\(=270\)
(...chắc sai...> . < ...)
Bài 1:
a; \(\dfrac{5}{18}\) + \(\dfrac{8}{19}\) - \(\dfrac{7}{21}\) + (- \(\dfrac{10}{36}\) + \(\dfrac{11}{19}\) + \(\dfrac{1}{3}\)) - \(\dfrac{5}{8}\)
= \(\dfrac{5}{18}\) + \(\dfrac{8}{19}\) - \(\dfrac{1}{3}\) -\(\dfrac{10}{36}\) + \(\dfrac{11}{19}\) + \(\dfrac{1}{3}\) - \(\dfrac{5}{8}\)
= (\(\dfrac{5}{18}\) - \(\dfrac{10}{36}\)) + (\(\dfrac{8}{19}\) + \(\dfrac{11}{19}\)) - (\(\dfrac{1}{3}\) - \(\dfrac{1}{3}\)) - \(\dfrac{5}{8}\)
= (\(\dfrac{5}{18}\) - \(\dfrac{5}{18}\)) + \(\dfrac{19}{19}\) - 0 - \(\dfrac{5}{8}\)
= 0 + 1 - \(\dfrac{5}{8}\)
= \(\dfrac{3}{8}\)
b; \(\dfrac{1}{13}\) + (\(\dfrac{-5}{18}\) - \(\dfrac{1}{13}\) + \(\dfrac{12}{17}\)) - (\(\dfrac{12}{17}\) - \(\dfrac{5}{18}\) + \(\dfrac{7}{5}\))
= \(\dfrac{1}{13}\) - \(\dfrac{5}{18}\) - \(\dfrac{1}{13}\) + \(\dfrac{12}{17}\) - \(\dfrac{12}{17}\) + \(\dfrac{5}{18}\) - \(\dfrac{7}{5}\)
= (\(\dfrac{1}{13}\) - \(\dfrac{1}{13}\)) + (\(\dfrac{12}{17}\) - \(\dfrac{12}{17}\)) + (-\(\dfrac{5}{18}\) + \(\dfrac{5}{18}\)) - \(\dfrac{7}{5}\)
= 0 + 0 + 0 - \(\dfrac{7}{5}\)
= - \(\dfrac{7}{5}\)
Bài 1 c;
\(\dfrac{15}{14}\) - (\(\dfrac{17}{23}\) - \(\dfrac{80}{87}\) + \(\dfrac{5}{4}\)) + (\(\dfrac{17}{23}\) - \(\dfrac{15}{14}\) + \(\dfrac{1}{4}\))
= \(\dfrac{15}{14}\) - \(\dfrac{17}{23}\) + \(\dfrac{80}{87}\) - \(\dfrac{5}{4}\) + \(\dfrac{17}{23}\) - \(\dfrac{15}{14}\) + \(\dfrac{1}{4}\)
= (\(\dfrac{15}{14}-\dfrac{15}{14}\)) + (\(-\dfrac{17}{23}+\dfrac{17}{23}\)) - (\(\dfrac{5}{4}\) - \(\dfrac{1}{4}\)) + \(\dfrac{80}{87}\)
= 0 + 0 - 1 + \(\dfrac{80}{87}\)
= - \(\dfrac{7}{87}\)
Gọi số học sinh lớp 6A là d(học sinh;dcN*)
Vì số học sinh khi xếp hàng 3;4;6 đều vừa đủ nên d chia hết cho 3;4;6 suy ra d cBC(3,4,6)
Ta có:
3=3;4=22;6=2.3
BCNN(3,4,6)=22.3=12
BC(3,4,6)=B(12)={0;12;24;36;48;.....}
dc {0;12;24;36;48;..........}
vì số học sinh trong khoảng từ 30 đến 40 học sinh nên 30<_d<_40
Vậy d=36;số học sinh lớp 6A là 36 học sinh
a) =10
b) =--297
cac ban giai day du cho mik nhe mik ko bit lam