7×380×(95-X)=3,8×4200×(X-25)
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\(x=\dfrac{7}{25}+\dfrac{-1}{5}=\dfrac{7}{25}-\dfrac{1}{5}=\dfrac{2}{25}.\\ x=\dfrac{5}{11}+\dfrac{4}{-9}=\dfrac{5}{11}-\dfrac{4}{9}=\dfrac{1}{99}.\\ \dfrac{5}{9}-\dfrac{x}{-1}=\dfrac{-1}{3}\Leftrightarrow\dfrac{5}{9}+x=-\dfrac{1}{3}.\Leftrightarrow x=-\dfrac{8}{9}.\)
\(x=\dfrac{7}{25}+-\dfrac{1}{5}=>\dfrac{7}{25}+-\dfrac{5}{25}=>x=\dfrac{2}{25}\)
\(x=\dfrac{5}{11}+\dfrac{4}{-9}=>\dfrac{-45}{-99}+\dfrac{44}{-99}=>x=\dfrac{-1}{-99}=\dfrac{1}{99}\)
\(\dfrac{5}{9}-\dfrac{x}{-1}=-\dfrac{1}{3}=>-\dfrac{1}{3}-\dfrac{5}{9}=>\dfrac{x}{-1}=-\dfrac{8}{9}=>x=-\dfrac{8}{9}\)
2 giờ 25 phút x 3 – 3,8 giờ *
= 7 giờ 15 phút - 3,8 giờ
=3,45 giờ
\(0,5\times40\times0,2\times20\times0,25\)
\(=\left(0,5\times0,2\right)\times\left(40\times20\times0,25\right)\)
\(=0,1\times200\)
\(=20\)
~ Hok tốt ~
a)y+25=(-63)-(-7)
y+25=(-63)+7
y+25=-56
y=(-56)-25
y=-81
b.y+20=95-75
y+20=20
y=20-20
y=0
c.11-(15+11)=x-(25-9)
11-26=x-16
-15=x-16
x=-15+16
x=1
d)x-25=(7-x)-(25+7)
2x-25=7-(25+7)
2x-25=7-32
2x-25=-25
2x=(-25)+25
2x=0
x=0:2
x=0
tick cho mk nha bạn
A, (X+1)+(x+4)+(x+7)+...+(x+25)+(x+28)=155
b,(x+9)+(x-2)+(x+7)
+(x-4)+(x+5)+(x-6)+(x+3)+(x-8)+(x+1)=95
A,(x+1)+(x+4)+(x+7)+...+(x+25)+(x+28)=155
x+1+x+4+x+7+...+x+25+x+28=155
x.[(28-1):3+1]+(1+4+7+...+25+28)=155
10.x+[(28+1).10:2]=155
10.x+145=155
A
<=>x+1+x+4+x+7+...+x+25+x+28=155
<=>10x.(1+4+7+10+13+16+19+22+25+28)=155
<=>10x.145 =155
<=>10x=155:145=\(\frac{31}{29}\)
x=\(\frac{31}{29}:10=\frac{31}{290}\)
Vậy x=\(\frac{31}{290}\)
\(\Leftrightarrow2660\left(95-x\right)=15960\left(x-25\right)\)
\(\Leftrightarrow252700-2660x-15960+399000x=0\)
\(\Leftrightarrow396340x=-236740\)
\(\Leftrightarrow x=-\dfrac{89}{149}\)