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( 14 x 230 + 7 x 540 ) : 700
= ( 7 x 2 x 230 + 7 x 540 ) : 700
= ( 7 x 460 + 7 x 540 ) : 700
= 7 x ( 460 + 540 ) : 700
= 7 x 1000 : 700
= 7000 : 700
= 10
1,8 x 230 + 0,9 x 540
=0,9 x (2 x 230) + 0,9 x 540
=0,9 x 460 + 0,9 x 540
=0,9 x (460 + 540)
=0,9 x 1000
=900
a) \(\Rightarrow\left(x-45\right):2=60\)
\(\Rightarrow x-45=120\Rightarrow x=165\)
b) \(\Rightarrow\left(x-2\right)\times4-12=152\)
\(\Rightarrow\left(x-2\right)\times4=164\)
\(\Rightarrow x-2=41\Rightarrow x=43\)
1.Ta có:1/2=1/1.2
1/6=1/2.3
1/12=1/3.4
........
=>1/2+1/6+1/12+1/20+1/30=1/1.2+1/2.3+1/3.4+1/4.5+1/5.6
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6
2.hinh nhu sai đe
2 * x + 3 * x + 4 * x + 5 * x + 6 * x + 7 * x = 540
x * ( 2 + 3 + 4 + 5 + 6 + 7 + 8 ) = 540
x * 27 = 540
x = 540 : 27
x = 20
Vậy x = 20
Chúc bạn học tốt!
2 * x + 3 * x + 4 * x + 5 * x + 6 * x + 7 * x = 540
x * ( 2 + 3 + 4 + 5 + 6 + 7 + 8 ) = 540
x * 27 = 540
x = 540 : 27
x = 20
Vậy x = 20
Chúc bạn học tốt!
\(x-\dfrac{1}{3}=\dfrac{2}{3}.\dfrac{9}{14}+\dfrac{3}{7}\)
\(x-\dfrac{1}{3}=\dfrac{1}{7}+\dfrac{3}{7}\)
\(x-\dfrac{1}{3}=\dfrac{4}{7}\)
\(x=\dfrac{19}{21}\)
a/\(x-\dfrac{5}{7}-\dfrac{13}{14}=1\)
\(x=1+\dfrac{5}{7}+\dfrac{13}{14}\)
\(x=\dfrac{14}{14}+\dfrac{10}{14}+\dfrac{13}{14}\)
\(x=\dfrac{37}{14}\)
Vậy \(x=\dfrac{37}{14}\)
b/\(\dfrac{3}{5}+x+1\dfrac{1}{5}=\dfrac{11}{3}\)
\(x+\dfrac{3}{5}+\dfrac{6}{5}=\dfrac{11}{3}\)
\(x+\dfrac{9}{5}=\dfrac{11}{3}\)
\(x=\dfrac{11}{3}-\dfrac{9}{5}\)
\(x=\dfrac{55}{15}-\dfrac{27}{15}\)
\(x=\dfrac{28}{15}\)
Vậy \(x=\dfrac{28}{15}\)
#kễnh
a) \(x-\dfrac{5}{7}-\dfrac{13}{14}=1\)
\(x-\dfrac{23}{14}=1\)
\(x=1+\dfrac{23}{14}\)
\(x=\dfrac{37}{14}\)
b) \(\dfrac{3}{5}+x+1\dfrac{1}{5}=\dfrac{11}{3}\)
\(x+1+\dfrac{3}{5}+\dfrac{1}{5}=\dfrac{11}{3}\)
\(x+\dfrac{9}{5}=\dfrac{11}{3}\)
\(x=\dfrac{11}{3}-\dfrac{9}{5}\)
\(x=\dfrac{28}{15}\)
= 7 x ( 2 x230) + 7 x 540
= 7 x 460 + 7 x 540
= 7 x ( 460 + 540)
= 7 x 1000
= 7000