19/20 - x : 8/5 =3/4 Trả lời nhanh nhanh nhé 😍
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a) \(x:\frac{1}{2}+\frac{3}{4}=1\frac{19}{20}\)
\(x:\frac{1}{2}+\frac{3}{4}=\frac{39}{20}\)
\(x:\frac{1}{2}=\frac{39}{20}-\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{39}{20}-\frac{15}{20}\)
\(x:\frac{1}{2}=\frac{24}{20}\)
\(x=\frac{24}{20}.\frac{1}{2}\)
\(x=\frac{3}{5}\)
\(x:\frac{1}{2}+\frac{3}{4}=1\frac{19}{20}\)
\(x:\frac{1}{2}=1\frac{19}{20}-\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{39}{20}-\frac{3}{4}\)
\(x:\frac{1}{2}=\frac{39}{20}-\frac{15}{20}\)
\(x:\frac{1}{2}=\frac{24}{20}\)
\(x=\frac{24}{20}\times\frac{1}{2}\)
\(x=\frac{24}{40}\)
\(x=\frac{3}{5}\)
a: \(\Leftrightarrow\left(x+2\right)\left(x-2\right)⋮x^2-7\)
\(\Leftrightarrow x^2-7\in\left\{1;-1;3;-3\right\}\)
hay \(x\in\left\{2\sqrt{2};-2\sqrt{2};\sqrt{6};-\sqrt{6};\sqrt{10}-\sqrt{10};2;-2\right\}\)
b: \(\Leftrightarrow2+2+2+...+x=2002\)
\(\Leftrightarrow2\left(\dfrac{x-2}{2}+1\right)=2002\)
\(\Leftrightarrow\left(x-2\right)\cdot\dfrac{1}{2}+1=1001\)
=>1/2(x-2)=1000
=>x-2=2000
hay x=2002
a) ( 72 - 8 x 9 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= ( 72 - 72 ) : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0 : ( 20 + 21 + 22 + 23 + 24 + 25 )
= 0
b) ( 500 x 9 - 250 x 18 ) x ( 1 + 2 + 3 + ... + 9 )
= ( 500 x 9 - 250 x 2 x 9 ) x ( 1 + 2 + 3 + ... + 9 )
= ( 500 x 9 - 500 x 9 ) x ( 1 + 2 + 3 + ... + 9 )
= 0 x ( 1 + 2 + 3 + ... + 9 )
= 0
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
= (1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+(10+20)
= 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +30
= 20x9 +30
=180+30
=210
tk cho mik nhé
\(2\frac{3}{4}\)+ \(3\frac{5}{8}\)+ \(4\frac{1}{2}\)= \(\frac{11}{4}\)+ \(\frac{29}{8}\)+\(\frac{9}{2}\)= \(\frac{22}{8}\)+ \(\frac{29}{8}\)+ \(\frac{36}{8}\)= \(\frac{87}{8}\)
\(x:\dfrac{8}{5}=\dfrac{19}{20}-\dfrac{3}{4}\)
\(x:\dfrac{8}{5}=\dfrac{1}{5}\)
\(x=\dfrac{1}{5}.\dfrac{8}{5}=\dfrac{8}{25}\)
8/25