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\(n_{O_2}=\dfrac{1,6}{32}=0,05\left(mol\right)=>n_A=0,05\left(mol\right)\)
=> \(M_A=\dfrac{3}{0,05}=60\left(g/mol\right)\)
=> D
C
\(SO_2+H_2O⇌H_2SO_3\)
\(K_2O+H_2O\rightarrow2KOH\)
\(BaO+H_2O\rightarrow Ba\left(OH\right)_2\)
\(SO_3+H_2O\rightarrow H_2SO_4\)
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
5:
a: AD/CD=BA/BC=3/5
b: ΔBAD đồng dạng vói ΔBHD
ΔCHD đồng dạng với ΔCAB
c: ΔCHD đồng dạng với ΔCAB
=>HD/AB=CD/CB
=>HD*CB=AB*CD
a, Thay x = 9 => \(\sqrt{x}=3\)vào M ta được :
\(M=\frac{3-1}{3}=\frac{2}{3}\)
b, Với x > 0 ; x \(\ne\)1
\(P=\frac{\sqrt{x}-2}{\sqrt{x}+1}+\frac{2+8\sqrt{x}}{x-1}-\frac{2}{1-\sqrt{x}}\)
\(=\frac{\left(\sqrt{x}-2\right)\left(\sqrt{x}-1\right)+2+8\sqrt{x}+2\left(\sqrt{x}+1\right)}{x-1}\)
\(=\frac{x-3\sqrt{x}+2+2+8\sqrt{x}+2\sqrt{x}+2}{x-1}=\frac{x+7\sqrt{x}+6}{x-1}\)
\(=\frac{\left(\sqrt{x}+1\right)\left(\sqrt{x}+6\right)}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}=\frac{\sqrt{x}+6}{\sqrt{x}-1}\)( đpcm )
giúp tớ với uhuhuuu