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\(\frac{16,2\cdot3,7+5,7\cdot16,2+7,8+4,8+4,6\cdot7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)\(=\frac{16,2\cdot(3,7+5,7)-7,8\cdot(4,8+4,6)}{(13,4-12,6)+(12,3-11,5)+(11,2-10,4)}\)
\(=\frac{16,2\cdot9,4-7,8\cdot9,4}{0,8+0,8+0,8}=32,9\)
~Chúc bạn học tốt
Mk ko chắc nữa
ta tach phep tinh do ra lam ahi ve .
ve A la phep tinh 16,2 * 3,7 +5,7 * 16,2
ve B la phep tinh con lai
ve A = 16,2 *9( 3,7 + 5,7 ) = ........
ve B = 7,8 * (4, 8+ 4,6 )=.......
cuoi cung bang ve A + ve B la ra
\(\left(126,74\times126,72+18,63:0,9\right)\times\left(126-12,6:0,125-12,6\times2\right)\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-\left(12,6:0,125+12,6\times2\right)\right]\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-\left(12,6\times8+12,6\times2\right)\right]\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left\{126-\left[12,6\times\left(8+2\right)\right]\right\}\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-(12,6\times10)\right]\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left(126-126\right)\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times0\)
\(=0\)
(126,74×126,72+18,63:0,9)×(126−12,6:0,125−12,6×2)(126,74×126,72+18,63:0,9)×(126−12,6:0,125−12,6×2)
=(126,74×126,72+18,63:0,9)×[126−(12,6:0,125+12,6×2)]=(126,74×126,72+18,63:0,9)×[126−(12,6:0,125+12,6×2)]
=(126,74×126,72+18,63:0,9)×[126−(12,6×8+12,6×2)]=(126,74×126,72+18,63:0,9)×[126−(12,6×8+12,6×2)]
=(126,74×126,72+18,63:0,9)×{126−[12,6×(8+2)]}=(126,74×126,72+18,63:0,9)×{126−[12,6×(8+2)]}
=(126,74×126,72+18,63:0,9)×[126−(12,6×10)]=(126,74×126,72+18,63:0,9)×[126−(12,6×10)]
=(126,74×126,72+18,63:0,9)×(126−126)=(126,74×126,72+18,63:0,9)×(126−126)
=(126,74×126,72+18,63:0,9)×0=(126,74×126,72+18,63:0,9)×0
=0=0
a: \(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{3}{4}=\dfrac{1}{5}\\x-\dfrac{3}{4}=-\dfrac{1}{5}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{19}{20}\\x=\dfrac{11}{20}\end{matrix}\right.\)
\(a,\left|x-\dfrac{3}{4}\right|=\dfrac{1}{5}\)
\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{3}{4}=\dfrac{1}{5}\\x-\dfrac{3}{4}=\dfrac{-1}{5}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{19}{20}\\x=\dfrac{11}{20}\end{matrix}\right.\)
\(b,\dfrac{-1}{3}+\left|x\right|=0,5\)
\(\Leftrightarrow\left|x\right|=\dfrac{5}{6}\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{5}{6}\\x=\dfrac{-5}{6}\end{matrix}\right.\)
#\(N\)
\(x+7,78=11,34\)
\(x=11,34-7,78\)
\(x=3,56\)
<=> 11 - 15 - x = x - 25 + 9
<=> -x - x = - 25 + 9 - 11 + 15
<=> - 2x = -12
<=> x = -12 : (- 2)
<=> x = 6
Tìm số nguyên x biết:
\(11-\left(15+x\right)=x-\left(25-9\right)\)
\(11-\left(15+x\right)=x-16\)
\(11-15-x=x-16\)
\(-x-x=-16-11+15\)
\(-2x=-16-11+15\)
\(-2x=-27+15\)
\(-2x=-12\)
\(-x=-12:2\)
\(-x=-6\)
\(=>x=6\)
Vậy \(x=6\)
\(2,4:0,125+2,4:0,25-2,4:0,5\)
\(=2,4\cdot8+2,4\cdot4-2,4\cdot2\)
\(=2,4\left(8+4-2\right)\)
\(=2,4\cdot10=24\)
2057,75 – (36+12,6) : 0,9 x 0,5
=2057,75 –48,6: 0,9 x 0,5
=2057,75 –27
=2030,75
làm ơn đi