giúp mình với, cảm ơn ạaa
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C
\(SO_2+H_2O⇌H_2SO_3\)
\(K_2O+H_2O\rightarrow2KOH\)
\(BaO+H_2O\rightarrow Ba\left(OH\right)_2\)
\(SO_3+H_2O\rightarrow H_2SO_4\)
A)vì tam giác ABC là tam giác cân
AB=BC=8
chu vi tam giác ABC=AB+AC+BC=8+5+8=21
B)vì tam giác ABC là tam giác cân
AB=BC=25
chu vi tam giác ABC=AB+AC+BC=25+12+25=62
Câu 2:
uses crt;
var a:array[1..100]of integer;
i,n,t:integer;
begin
clrscr;
write('Nhap n='); readln(n);
for i:=1 to n do
begin
write('A[',i,']='); readln(a[i]);
end;
t:=0;
for i:=1 to n do
if (4<a[i]) and (a[i]<15) then t:=t+a[i];
writeln(t);
readln;
end.
a: =căn 16/5*36/5*49=7*4*9/5=252/5
b: =căn 250*2,5=căn 625=25
c: =căn 3/2*2/3=1
d: =5*căn 2*7*căn 2=70
Câu 4:
a, \(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
\(4K+O_2\underrightarrow{t^O}2K_2O\)
b, \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
c, \(2K+2H_2O\rightarrow2KOH+H_2\)
\(CaO+H_2O\rightarrow Ba\left(OH\right)_2\)
\(SO_3+H_2O\rightarrow H_2SO_4\)
1 I'd rather you didn't go out this Christmas
2 I'd rather the children went to bed
3 I'd rather you helped your mother with housework
4 I'd rather you didn't come to class late
5 I'd rather you kept silent in the classroom
It's time
1 It's time for you to dress yourself
2 It's about time the children went to bed
3 It's time we hurried up or we will be late for the train
4 It's high time children went to bed
5 It's about time for us to go home