x * 8 +(90 +15 ) = 775
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Bài 2:
a: x+24=-15-4=-19
=>x=-19-24=-43
b: x+73=-127
=>x=-127-73=-200
c: |x-1|=|-10|+2=10+2=12
=>x-1=12 hoặc x-1=-12
=>x=13 hoặc x=-11
d: x+145=131-(-169)=131+169=300
=>x=155
e: x-96=443-(-15)=443+15=458
=>x=554
$(14023 xx 9 + 38942 xx 8 + 13991 xx 7) xx (15 x 6 - 90)\\=(14023 xx 9 + 38942 xx 8 + 13991 xx 7) xx(90-90)\\(14023 xx 9 + 38942 xx 8 + 13991 xx 7) xx0\\=0$
\(\frac{11}{15}-\left(\frac{7}{9}+x\right).\frac{3}{8}=\frac{61}{90}+\frac{x}{3}\)(. là dấu nhân)
\(\Leftrightarrow\frac{11}{15}-\frac{7}{24}-\frac{3x}{8}-\frac{61}{90}-\frac{x}{3}=0\)
\(\Leftrightarrow\frac{-17}{72}-\left(\frac{3x}{8}+\frac{x}{3}\right)=0\)
\(\Leftrightarrow\frac{17x}{24}=-\frac{17}{72}\)
\(\Leftrightarrow17x.72=-17.24\)
\(\Leftrightarrow x=-\frac{1}{3}\)
\(\frac{11}{15}-\left(\frac{7}{9}+x\right).\frac{3}{8}=\frac{61}{90}+\frac{x}{3}\)
\(\Rightarrow\frac{11}{15}-\frac{7}{9}.\frac{3}{8}-\frac{3x}{8}=\frac{61}{90}+\frac{x}{3}\)
\(\Rightarrow\frac{11}{15}-\frac{7}{24}-\frac{3x}{8}=\frac{61}{90}+\frac{x}{3}\)
\(\Rightarrow\frac{53}{120}-\frac{3x}{8}=\frac{61}{90}+\frac{x}{3}\)
\(\Rightarrow\frac{53}{120}-\frac{61}{90}=\frac{8x+9x}{24}\)
\(\Rightarrow-\frac{17}{72}=\frac{17x}{24}\)
\(\Rightarrow\frac{-17}{72}.24=17x\)
\(\Rightarrow-17.3=17x\Leftrightarrow x=-3\)
\(5^{15}+25^7+5^{13}=5^{15}+\left(5^2\right)^7+5^{13}\)
\(=5^{15}+5^{14}+5^{13}=5^{11}\left(5^4+5^3+5^2\right)\)
\(=5^{11}.\left(625+125+25\right)=5^{11}.775⋮775\)
[(90-15xX)-8]x5+10=30
_____________=30-10
___________=20:5
_________=4+8
15xX=90-12
X=78:15
X=5.2
[(90-15x X)-8] x 5 + 10 = 60 x 0,5
[(90-15xX)-8] x 5 + 10 = 30
[(90-15xX)-8] x 5 = 30 - 10 = 20
(90-15xX)-8 = 20 : 5 = 4
90 - 15xX = 4 + 8 = 12
15xX = 90-12
15xX = 78
X = 78 : 15
X = 5,2
x * 8 +(90 +15 ) = 775
=> x * 8 + 105 = 775
=> x * 8 = 775 - 105
=> x * 8 = 670
=> x = 670 : 8
=> x = 95
x*8+105=775
x*8=775-105
x*8=670
x=670:8
x=83,75