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a,x:15+42=15+25x8
x:15+42=15+200
x:15+42 =250
x:15 =250-42
x:15 =208
x =208x15
x =3120
15 x X + 15 x 2,7 = 15
15 x ( X + 2,7) = 15
X + 2, 7 = 15 : 15
X + 2,7 = 1
X = 1 - 2,7
X = - 1,7
15 x 20 - 15 x 10 + 15 x 40
= 15 x ( 20 - 10 + 40 )
= 15 x 50
= 750
\(15.8-15-8+15.8+15-8\)
\(=15.\left(8-1+1\right)+8.\left(15-1-1\right)\)
\(=15.8+8.13\)
\(=8.\left(15+13\right)\)
\(=8.28\)
\(=224\)
15.8 − 15 − 8 + 15.8 + 15 − 8
= 15. (8 − 1 + 1 )+ 8. (15 − 1 − 1)
= 15.8 + 8.13
= 8. (15 + 13)
= 8.28
= 224
hộ mik nha
a)\(2.x-\frac{3}{2}=\frac{1}{2}\)
\(2x=\frac{4}{2}\)
\(x=\frac{4}{2}:2\)
\(x=1\)
Vậy x=1
b)\(\frac{8}{13}.x+\frac{5}{13}.x=\frac{1}{10}\)
\(x.\left(\frac{8}{13}+\frac{5}{13}\right)=\frac{1}{10}\)\
\(x.1=\frac{1}{10}\)
\(x=\frac{1}{10}\)
Vậy x=\(\frac{1}{10}\)
c)\(\frac{2}{15}+\frac{7}{15}.x=\frac{1}{15}\)
\(\frac{7}{15}x=\frac{-1}{15}\)
x=\(\frac{-1}{7}\)
Vậy \(x=\frac{-1}{7}\)
\(\frac{3}{2}\cdot x-\frac{3}{2}=\frac{1}{2}\) \(\frac{8}{13}\cdot x+\frac{5}{13}\cdot x=\frac{1}{10}\)
\(\frac{3}{2}\cdot x=\frac{3}{2}+\frac{1}{2}=2\) \(\left[\frac{8}{13}+\frac{5}{13}\right]\cdot x=\frac{1}{10}\)
\(x=2:\frac{3}{2}\) \(1\cdot x=\frac{1}{10}\)
x=\(\frac{4}{3}\) \(x=\frac{1}{10}:1\)
Vậy x=\(\frac{4}{3}\) \(x=\frac{1}{10}\)
Vậy x=\(\frac{1}{10}\)
c,\(\frac{2}{5}+\frac{7}{15}\cdot x=\frac{1}{15}\)
\(\frac{7}{15}\cdot x=\frac{1}{15}-\frac{2}{5}=\frac{-1}{3}\)
\(x=\frac{-1}{3}:\frac{7}{15}\)
\(x=\frac{-5}{7}\)
Vậy x=\(\frac{-5}{7}\)
444,26
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