HOC24
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BAN NHO THEM ''vien bi " vao moi dap an nhe
so bi cua dung la
6:\(\dfrac{1}{3}\)=6.3=18
tong so vien bbi hai ban co la 6+18=24
D/S:24
hello ban
ti so cua 2 so do la
\(\dfrac{4}{5}\):\(\dfrac{2}{3}\)=\(\dfrac{4}{5}\).\(\dfrac{3}{2}\)=\(\dfrac{6}{5}\)
ta co so do
so thu nhat |_|_|_|_|_|_|(6)
so thu hai |_|_|_|_|_|(5)
so thu nhat la
495:(6+5).6=270
so thu hai la
495-270=225
d/
x+\(\dfrac{30}{100}\).x=-1,31
x.1+\(\dfrac{30}{100}\)x=\(\dfrac{-131}{100}\)
x(1+\(\dfrac{30}{100}\))=\(\dfrac{-131}{100}\)
x(\(\dfrac{100}{100}\)+\(\dfrac{30}{100}\))=\(\dfrac{-131}{100}\)
x.\(\dfrac{130}{100}\)=\(\dfrac{-131}{100}\)
x=\(\dfrac{-131}{100}\):\(\dfrac{130}{100}\)
x=\(\dfrac{130}{100}\).\(\dfrac{100}{131}\)
x=\(\dfrac{100.130}{131.100}\)
x=\(\dfrac{130.1}{131.1}\)
x=\(\dfrac{130}{131}\)
ngay thu hai lam duoc so pt la
100-42=58%
so san pham ho lam duoc theo ke hoach la
290:58%=290:\(\dfrac{58}{100}\)=290.\(\dfrac{100}{58}\)=290.\(\dfrac{50}{29}\)=500(san pham)
ngay thu nhat lam duoc la
500-290=210(sp)
de co
goi d la UC(2n+3;4n+8)
2n+3⋮d
4n+8⋮d
(2n+3)-(4n+8)⋮d
2(2n+3)-1(4n+8)⋮d
(4n+6)-(4n+8)⋮d
-2⋮d
maf d la so le khong phai la so chan
-1⋮d
d ϵ {1;-1}
suy ra \(\dfrac{2n+3}{4n+8}\)la phan so toi gian voi moi so n
hello\
phan so hoc sinh gioi cua lop
1-(\(\dfrac{7}{15}\)+\(\dfrac{1}{3}\))=1-(\(\dfrac{7}{15}\)+\(\dfrac{5}{15}\))=1-\(\dfrac{12}{15}\)=1-\(\dfrac{4}{5}\)=\(\dfrac{5}{5}\)-\(\dfrac{4}{5}\)=\(\dfrac{1}{5}\)(ban)
b)so hoc sinh cua lop do la
9:\(\dfrac{1}{5}\)=9.5=45(ban)
so hoc sinh kha la
45.\(\dfrac{1}{3}\)=15 (hoc sinh)
so hoc sinh trung bimh la
45.\(\dfrac{7}{15}\)=21(ban)
D/S a)\(\dfrac{1}{5}\)
b)so hoc sinh trung binh 21
so hoc sinh kha laa 15