Mọi người giải cho mình bài này với.Mình đang gấp
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(R_{tđ}=\dfrac{R_1\cdot R_2}{R_1+R_2}=\dfrac{24\cdot12}{24+12}=8\Omega\)
\(I=\dfrac{U}{R}=\dfrac{12}{8}=1,5A\)
\(P=\dfrac{U^2}{R}=\dfrac{12^2}{8}=18W\)
\(Q_{tỏa1}=A_1=U_1\cdot I_1\cdot t=12\cdot\dfrac{12}{24}\cdot1\cdot3600=21600J\)
\(Q_{tỏa2}=A_2=U_2\cdot I_2\cdot t=12\cdot\dfrac{12}{12}\cdot1\cdot3600=43200J\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(3x-4-x-1)(3x-4+x+1)=0
(2x-5)(4x-3)=0
2x-5 = 0 hoặc 4x-3=0
2x=5 hoặc 4x=3
x=5/2 hoặc x=3/4
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2\(\sqrt{\dfrac{16}{3}}\) - 3\(\sqrt{\dfrac{1}{27}}\) - \(\dfrac{3}{2\sqrt{3}}\)
= \(\dfrac{8}{\sqrt{3}}\) - \(\dfrac{3}{3\sqrt{3}}\) - \(\dfrac{3}{2\sqrt{3}}\)
= \(\dfrac{8}{\sqrt{3}}\) - \(\dfrac{1}{\sqrt{3}}\) - \(\dfrac{3}{2\sqrt{3}}\)
= \(\dfrac{16}{2\sqrt{3}}\) - \(\dfrac{2}{2\sqrt{3}}\) - \(\dfrac{3}{2\sqrt{3}}\)
= \(\dfrac{11}{2\sqrt{3}}\)
= \(\dfrac{11\sqrt{3}}{6}\)
f, 2\(\sqrt{\dfrac{1}{2}}\)- \(\dfrac{2}{\sqrt{2}}\) + \(\dfrac{5}{2\sqrt{2}}\)
= \(\dfrac{2}{\sqrt{2}}\) - \(\dfrac{2}{\sqrt{2}}\) + \(\dfrac{5}{2\sqrt{2}}\)
= \(\dfrac{5}{2\sqrt{2}}\)
= \(\dfrac{5\sqrt{2}}{4}\)
(1 + \(\dfrac{3-\sqrt{3}}{\sqrt{3}-1}\)).(1- \(\dfrac{3+\sqrt{3}}{\sqrt{3}+1}\))
= \(\dfrac{\sqrt{3}-1+3-\sqrt{3}}{\sqrt{3}-1}\).\(\dfrac{\sqrt{3}+1-3+\sqrt{3}}{\sqrt{3}+1}\)
= \(\dfrac{2}{\sqrt{3}-1}\).\(\dfrac{-2}{\sqrt{3}+1}\)
= \(\dfrac{-4}{3-1}\)
= \(\dfrac{-4}{2}\)
= -2
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var st,s1,s2:string;
i,max,x,y,d1,d2:integer;
begin
clrscr;
write('Nhap xau:'); readln(st);
s1:=#32;
for i:=1 to length(st) do
if st[i] in ['a'..'z'] then s1:=s1+st[i];
d1:=length(s1);
for i:=1 to d1 do
s1[i]:=upcase(s1[i]);
writeln('Xau ky tu da chuyen sang hoa la: ',s1);
s2:=#32;
for i:=1 to length(st) do
if st[i] in ['0'..'9'] then s2:=s2+st[i];
write('Day so dao nguoc la: ');
d2:=length(s2);
for i:=d2 downto 1 do
write(s2[i]);
writeln;
max:=0;
for i:=1 to d2 do
begin
val(s2[i],x,y);
if max<x then max:=x;
end;
writeln('Chu so lon nhat la: ',max);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
sai đề hay sao ý bn
Số tuổi của bà là: (80+66):2=73(tuổi)
Số tuổi của cháu là: 73-66=7(tuổi)