tìm x
0,05 x = 7/12 + 11/30
m.n giup mk với
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7 x ( x : 7 ) = 833
x : 7 = 833 : 7
x : 7 = 119
x = 119 x 7
x = 883
Vậy x = 833
7 x ( x : 7 ) = 833
( x : 7 ) = 833 : 7
( x : 7 ) = 119
x = 119 x 7
x = 833
Không biết có đúng hay không!
a) \(6x+15\times8=12\times\left(19-x\right)\)
\(6x+120=228-12x\)
\(6x+120-228+12x=0\)
\(18x-108=0\)
\(18x=108\)
\(x=6\)
b) \(160-\left(35\div x+3\right)\times15=15\)
\(160-\left(35\div x+3\right)=1\)
\(35\div x+3=159\)
\(35\div x=156\)
\(x=\dfrac{35}{156}\)
c) \(2x-\left(1309\div11-19\right)-2=0\)
\(2x-1309\div11-19=2\)
\(2x-119-19=2\)
\(2x-119=21\)
\(2x=140\)
\(x=70\)
d) \(\left(x-7\right)\times\left(2x-16\right)=0\)
\(x-7=0;2x-16=0\)
\(x=7;2x=16\)
\(x=7;x=8\)
Câu 1:
a) = \(\dfrac{-7}{2}\) x \(\dfrac{45}{32}\) = \(\dfrac{-315}{64}\)
b) = \(\dfrac{18}{7}\) : \(\dfrac{-27}{14}\) = \(\dfrac{18}{7}\) x \(\dfrac{14}{-27}\) = \(\dfrac{-4}{3}\)
c) = \(\dfrac{-3}{8}\) x ( \(\dfrac{5}{11}\) + \(\dfrac{6}{11}\) + 2 ) = \(\dfrac{-3}{8}\) x 3 = \(\dfrac{-9}{8}\)
Câu 2:
\(\dfrac{-3}{5}\) . x + \(\dfrac{7}{6}\) = \(\dfrac{5}{4}\)
\(\Leftrightarrow\) \(\dfrac{-3}{5}\) . x = \(\dfrac{5}{4}\) - \(\dfrac{7}{6}\)
\(\Leftrightarrow\) \(\dfrac{-3}{5}\) . x = \(\dfrac{1}{12}\)
\(\Leftrightarrow\) x = \(\dfrac{1}{12}\) : \(\dfrac{-3}{5}\)
\(\Leftrightarrow\) x = \(\dfrac{-5}{36}\)
Số số hạng là : ( 20 - 1 ) : 1 + 1 = 20 ( số )
Tổng là : ( 20 + 1 ) x 20 : 2 = 210
~ Chúc học tốt ~
Ai ngang qua xin để lại 1 L - I - K - E
\(\frac{12}{7}\times\frac{2}{11}+\frac{12}{11}\times\frac{15}{7}-\frac{12}{7}\times\frac{6}{11}\)
\(=\frac{12}{7}\times\frac{2}{11}+\frac{12}{7}\times\frac{15}{11}-\frac{12}{7}\times\frac{6}{11}\)
\(=\frac{12}{7}\times\left(\frac{2}{11}+\frac{15}{11}-\frac{6}{11}\right)\)
\(=\frac{12}{7}\times1=\frac{12}{7}\)
\(\frac{12}{7}.\frac{2}{11}+\frac{12}{11}.\frac{15}{7}-\frac{12}{7}.\frac{6}{11}\)
= \(\frac{24}{77}\)+\(\frac{180}{77}\)-\(\frac{72}{77}\)
=\(\frac{132}{77}\)
13 - 12 + 11 + 10 - 9 + 8 - 7 -6+ 5 -4 + 3 + 2 -1
= 13 - ( 12 - 11 - 10 + 9 ) + ( 8-7-6+ 5 ) - ( 4 - 3 - 2 + 1 )
= 13 - 0 + 0 -0
=13
Học tốt !
\(2.x-15=11\)
\(2x=11+15\)
\(2x=26\)
\(x=26:2\)
\(x=13\)
\(b,4.\left(2-x\right)-5\left(3-x\right)=-12\)
\(8-4x-15+5x=-12\)
\(x-7=-12\)
\(x=-12+7\)
\(x=-5\)
\(c,\left|x-7\right|+13=25\)
\(\left|x-7\right|=25-13\)
\(\left|x-7\right|=12\)
\(\Rightarrow\orbr{\begin{cases}x-7=12\\x-7=-12\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=19\\x=-5\end{cases}}\)
\(x=\left(\dfrac{7}{12}+\dfrac{11}{30}\right):0,05=\dfrac{19}{20}:0,05=19\)
\(0,05\) \(\times\) x=\(\dfrac{19}{20}\)=\(0,95\)
x=\(0,95:0,05\)
x=\(19\)