Tìm x :
x * 8 = 72
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a) -2(2x - 8) + 3(4 - 2x) = -72 - 5(3x - 7)
=> -4x + 18 + 12 - 6x = -72 - 15x + 35
=> -10x + 15x = -37 - 30
=> 5x = -37
=> x = -7,4
b) 3|2x2 - 7| = 33
=> |2x2 - 7| = 11
=> \(\orbr{\begin{cases}2x^2-7=11\\2x^2-7=-11\end{cases}}\)
=> \(\orbr{\begin{cases}2x^2=18\\2x^2=-4\left(loại\right)\end{cases}}\)
=> \(\orbr{\begin{cases}x=3\\x=-3\end{cases}}\)
\(x+\frac{5}{7}=\frac{7}{8}:\frac{1}{6}\)
\(\Leftrightarrow x+\frac{5}{7}=\frac{21}{4}\)
\(\Leftrightarrow x=\frac{127}{28}\)
\(\frac{72}{104}=\frac{72:8}{104:8}=\frac{9}{13}\)
\(\frac{3}{13}< \frac{4}{13}< \frac{5}{13}< \frac{6}{13}< \frac{7}{13}< \frac{8}{13}< \frac{72}{104}=\frac{9}{13}\)
Tìm x :
a ) \(x+\frac{5}{7}=\frac{7}{8}\div\frac{1}{6}=\frac{7\times6}{8\times1}=\frac{21}{4}\)
\(x=\frac{21}{4}-\frac{5}{7}=\frac{127}{28}\)
b ) \(\frac{15}{6}-x=\frac{5}{8}\times\frac{2}{15}=\frac{1}{12}\)
\(x=\frac{15}{6}-\frac{1}{12}=\frac{29}{12}\)
Rút gọn : \(\frac{72}{104}=\frac{72\div8}{104\div8}=\frac{9}{13}\)
Điền STN thích hợp :
\(\frac{3}{13}< \frac{4}{13}< \frac{5}{13}< \frac{6}{13}< \frac{7}{13}< \frac{8}{13}< \frac{9}{13}\left(\frac{72}{104}\right)\)Những số cần điền là : 4, 5, 6, 7, 8 .
==========> CHÚC HỌC GIỎI NHỚ K MÌNH <==========
\(72-\frac{x}{2}=x-\frac{70}{9}\)
\(72-\frac{x}{2}-x+\frac{70}{9}=0.\)
\(\left(72+\frac{70}{9}\right)-\left(\frac{x}{2}+x\right)=0\)
\(\frac{718}{9}-\left(\frac{x}{2}+\frac{x\cdot2}{2}\right)=0\)
\(\frac{718}{9}-\frac{x+\left(x\cdot2\right)}{2}=0\)
\(\frac{x+\left(x\cdot2\right)}{2}=\frac{-718}{9}\)
\(\frac{x\left(1+2\right)}{2}=-\frac{718}{9}\)
\(\frac{x\cdot3}{2}=-\frac{718}{9}\)
\(\frac{x\cdot27}{18}=-\frac{1436}{18}\)
\(\Rightarrow x\cdot27=-1436\)
ok tự tính ko chết vs cái máy mất
a. X : 1,8 = 72
X = 72 x 1,8
X = 129,6
b. 9,3 x 6,7 + 9,3 x 3,3
= 9,3 x ( 6,7 + 3,3 )
= 9,3 x 10 = 93
Ta có : 91-(27+x)=38
<=>91-27-x=38
<=>91-27-38=x
<=>x=26
39+(x-17)=72
<=>39+x-17=72
<=>x=72+17-39
<=>x=50
Tk mình nha!
\(91-\left(27+x\right)=28\)
\(27+x=91-28\)
\(27+x=63\)
\(x=63-27\)
\(x=36\)
\(39+\left(x-17\right)=72\)
\(x-17=72-39\)
\(x-17=33\)
\(x=33+17\)
\(x=50\)
hok tốt
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a/ 2130-(x+130)+72=-64
\(2130-\left(x+130\right)=-64-72\) \(2130-\left(x+130\right)=-136\)\(x+130=2130+136\)\(x+130=2266\)\(x=2266-130\)\(x=2136\)vậy x=2136
a/ 2130-(x+130)+72=-64
<=> -x-130+72+2130=-64
<=> x=2130+72-130+64=2136
b/135-|9-x|=35
<=> |9-x|=135-35=100
<=> \(\left[\begin{array}{nghiempt}9-x=100\\9-x=-100\end{array}\right.\)
<=>\(\left[\begin{array}{nghiempt}x=-91\\x=109\end{array}\right.\)
c/10-|x+3|=-4-(-10)
<=> |x+3|=10+4+(-10)
<=>|x+3|=4
<=>\(\left[\begin{array}{nghiempt}x+3=4\\x+3=-4\end{array}\right.\)
<=>\(\left[\begin{array}{nghiempt}x=1\\x=-7\end{array}\right.\)
x= 72: 8
x = 9
nha ban
x.8=12
x=12:8
x=3/2
=1.5