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b,\(-\frac{5}{7}.\frac{4}{13}+-\frac{5}{7}.\frac{9}{13}+-\frac{2}{7}\)
\(=-\frac{5}{7}.\left(\frac{4}{13}+\frac{9}{13}\right)+-\frac{2}{7}\)
\(=-\frac{5}{7}+-\frac{2}{7}=-1\)
học tốt nha e!
a, \(\frac{2}{3}+\left(\frac{3}{11}+-\frac{2}{5}\right)+-\frac{2}{5}\)
\(=\frac{2}{3}+(-\frac{22}{55}+-\frac{2}{5})\)
\(=\frac{2}{3}+-\frac{44}{115}=....??\)
a) \(\left(3.x-12\right).3=27\)
\(\Rightarrow3x-12=27:3\)
\(\Rightarrow3x-12=9\)
\(\Rightarrow3x=9+12\)
\(\Rightarrow3x=21\)
\(\Rightarrow x=21:3\)
\(\Rightarrow x=7\)
b) \(7.\left(4.x\right)=14\)
\(\Rightarrow4.x=14:7\)
\(\Rightarrow4.x=2\)
\(\Rightarrow x=2:4\)
\(\Rightarrow x=\frac{1}{2}\)
\(\left(3.x-12\right).3=27\) \(7.\left(4.x\right)=14\)
\(3.x-12=27:3\) \(4.x=14:7\)
\(3.x-12=9\) \(4.x=2\)
\(3.x=9+12\) \(x=2:4\)
\(3.x=21\) \(x=\frac{1}{2}.\)
\(x=21:3\)
\(x=7.\)
x2+25=150-25=125
x2=125-25=100
x2=102
x=10
lk giup anh nha anh lop8
\(x^2+25=150-5^2\Leftrightarrow x^2=125-25\Leftrightarrow x=\sqrt{100}=10\)
\(Vậy x=10\)
a: \(\Leftrightarrow x^2=\dfrac{-5}{2}\cdot\dfrac{-10}{9}=\dfrac{50}{18}=\dfrac{25}{9}\)
=>x=5/3hoặc x=-5/3
c: \(\Leftrightarrow4\left(x-\dfrac{5}{8}\right)=\dfrac{1}{4}+\dfrac{3}{4}=1\)
=>x-5/8=1/4
hay x=2/8+5/8=7/8
d: \(\Leftrightarrow\left|x-3\right|=\dfrac{2}{5}+\dfrac{3}{5}=1\)
=>x-3=1 hoặc x-3=-1
=>x=4 hoặc x=2
e: =>1-1/2x=-3
=>1/2x=4
hay x=8
a,3x-10=2x+13
\(\Rightarrow\)3x-2x=10+13
\(\Rightarrow\)x=23
b,x+12=-5-x
\(\Rightarrow\)x+x=-12-5
\(\Rightarrow\)2x=-17
\(\Rightarrow\)x=-8,5
c,x+5=10-x
\(\Rightarrow\)x+x=-5+10
\(\Rightarrow\)2x=5
\(\Rightarrow\)x=2,5
e,12-x=x+1
\(\Rightarrow\)-x-x=-12+1
\(\Rightarrow\)-2x=-11
\(\Rightarrow\)x=5,5
f,14+4x=3x+20
\(\Rightarrow\)4x-3x=-14+20
\(\Rightarrow\)x=6
g,2.(x-1)+3(x-2)=x-4
\(\Rightarrow\)2x-2+3x-6=x-4
\(\Rightarrow\)2x-2+3x-6-x+4=0
\(\Rightarrow\)4x-4=0
\(\Rightarrow\)4x=4
\(\Rightarrow\)x=1
h,3(4-x)-2(x-1)=x+20
\(\Rightarrow\)12-3x-2x+2-x-20=0
\(\Rightarrow\)-6x-6=0
\(\Rightarrow\)-6x=6
\(\Rightarrow\)x=-1
i,4(2x+7)-3(3x-2)=24
\(\Rightarrow\)8x+28-9x+6=24
\(\Rightarrow\)-x+34=24
\(\Rightarrow\)-x=-10
\(\Rightarrow\)x=10
k,3(x-2)+2x=10
\(\Rightarrow\)3x-6+2x=10
\(\Rightarrow\)5x-6=10
\(\Rightarrow\)5x=16
\(\Rightarrow\)x=3,2
Phần d, tớ không biết làm!!!!
132-x=52
169-x=25
x=169-25
x=144
x=13^2-5^2
x=169-25
x=144