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a) \(85\times16+16\times15\)
\(=16\times\left(85+15\right)\)
\(=16\times100=1600\)
b) \(\left(\dfrac{3}{7}\times\dfrac{11}{15}+\dfrac{3}{7}\times\dfrac{4}{15}\right):\left(4+2\dfrac{6}{11}-\dfrac{6}{11}\right)\)
\(=\left[\dfrac{3}{7}\times\left(\dfrac{11}{15}+\dfrac{4}{15}\right)\right]:\left(4+\dfrac{28}{11}-\dfrac{6}{11}\right)\)
\(=\dfrac{3}{7}\times1:\left(4+2\right)\)
\(=\dfrac{3}{7}:6\)
\(=\dfrac{3}{7}\times\dfrac{1}{6}=\dfrac{3}{42}=\dfrac{1}{14}\)
c) \(x+\left(x+3\right)+\left(x+6\right)+...+\left(x+102\right)=1855\)
\(\Rightarrow35x+\left(3+6+...+102\right)=1855\)
\(\Rightarrow35x+\left(102+3\right)\times34:2=1855\)
\(\Rightarrow35x+1785=1855\)
\(\Rightarrow35x=1855-1785\)
\(\Rightarrow35x=70\)
\(\Rightarrow x=70:35\)
\(\Rightarrow x=2\)
Vậy...
\(#Tmiamm\)
\(x+x:3\times15=\frac{364}{4}+\frac{102}{6}\)
\(x+x\times\frac{1}{3}\times15=91+17\)
\(x+x\times5=108\)
\(x\times\left(1+5\right)=108\)
\(x\times6=108\)
\(x=108:6\)
\(x=18\)
\(x+x:3\times15=\frac{364}{4}+\frac{102}{6}\)
\(x+x\times5=91+17\)
\(x\times1+x\times5=108\)
\(x\times\left(1+5\right)=108\)
\(x\times6=108\)
\(x=108:6=18\)
1.53x201=10653
2.
a)4 xX-15x4=6x15+X
<=>4x-60=90+x
<=>4x-x=60+90
<=>3x=150
<=>x=50
b(102+28-2x):20-5=1
<=>(130-2x):20=6
<=>130-2x=120
<=>2x=10
<=>x=5
c)1999x-x=1999+1997+1999
<=>1998x=5995
<=>\(x\approx3\)
d)105-5x=150:15
<=>105-5x=10
<=>5x=95
<=>x=19
e)(x+1)+(x+2)+(x+3)+...+(x+6)=78
<=>6x+21=78
<=>6x=57
<=>x=9,5
1) 53x201=53x200+53=10600+53=10653
2a)
4x-15x4=6x15+x
4x-60=90+x
4x-x=90+60
3x=150
x=50
b) x=5
c) x=3
d)x=19
e) x=9,5
a. \(x+\frac{x}{3}\cdot15=\frac{424}{4}+\frac{102}{6}\)
\(x+5x=106+17\)
\(x\left(1+5\right)=123\)
\(6x=123\)
\(x=\frac{123}{6}=\frac{41}{2}\)
b. \(100-x+\frac{5\cdot2}{2}-0=0\)
\(100-x+5=0\)
\(105-x=0\)
\(x=105-0=105\)
X+4,9 x 102=507,87
X+499,8=507,87
X=507,87-499,8
X=8,07
3/4:X+1/2=5/6
3/4:X=1/3
X=9/4
\(1)x+4,9\cdot102=507,87\)
\(\Leftrightarrow x+499,8=507,87\)
\(\Leftrightarrow x=507,87-499,8\)
\(\Leftrightarrow x=8,07\)
Vậy x=8,07
\(2)\frac{3}{4}:x+\frac{1}{2}=\frac{5}{6}\)
\(\Leftrightarrow\frac{3}{4}:x=\frac{5}{6}-\frac{1}{2}\)
\(\Leftrightarrow\frac{3}{4}:x=\frac{5}{6}-\frac{3}{6}\)
\(\Leftrightarrow\frac{3}{4}:x=\frac{2}{6}\left(=\frac{1}{3}\right)\)
\(\Leftrightarrow\frac{3}{4}:x=\frac{1}{3}\)
\(\Leftrightarrow x=\frac{3}{4}:\frac{1}{3}\)
\(\Leftrightarrow x=\frac{3}{4}\cdot\frac{3}{1}\)
\(\Leftrightarrow x=\frac{9}{4}\)
Vậy x=\(\frac{9}{4}\)
x+15x= 324/4 + 102/6
⇒16x = 81 + 17
⇒16x = 98
⇒x = 98 ÷ 16
⇒x= 6,125
Vậy x = 6,125
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