-12.(x-5)+7(3-x)=5
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a) 3/4-3/4:x=1/2
=>3/4:x=3/4-1/2
=>3/4:x=3/4-2/4
=>3/4:x=1/4
=>x=3/4:1/4
=>x=3/4.4/1
=>x=4
b)-12.(x-5)+7.(3-x)=5
=>-12x+60+21-7x=5
=>81-19x=5
=>19x=81-5
=>19x=76
=>x=76:19
=>x=4
c) |7x+3|=66
=>7x+3=-66 hoặc 7x+3=66
+)Nếu 7x+3=-66
=>7x=-66-3=-66+(-3)=-69
=>x=(-69):7=\(\frac{-69}{7}\)
+)Nếu 7x+3=66
=>7x=66-3=63
=>x=x=63:7=9
d)(x-7)(x+3)<0
=>x-7<0 hoặc x+3<0
+)/nếu x-7<0
=>x<7
+)nếu x+3<0
=>x<-3
a, 7\(\dfrac{3}{5}\) : \(x\) = 5\(\dfrac{4}{15}\) - 1\(\dfrac{1}{6}\)
\(\dfrac{38}{5}\) : \(x\) = \(\dfrac{79}{15}\) - \(\dfrac{7}{6}\)
\(x\) = \(\dfrac{41}{10}\)
\(x\) = \(\dfrac{38}{5}\) : \(\dfrac{41}{10}\)
\(x\) = \(\dfrac{76}{41}\)
b, \(x\) \(\times\) 2\(\dfrac{2}{3}\) = 3\(\dfrac{4}{8}\) + 6\(\dfrac{5}{12}\)
\(x\) \(\times\) \(\dfrac{8}{3}\) = \(\dfrac{7}{2}\) + \(\dfrac{77}{12}\)
\(x\) \(\times\) \(\dfrac{8}{3}\) = \(\dfrac{119}{12}\)
\(x\) = \(\dfrac{119}{12}\)
\(x\) = \(\dfrac{119}{12}\): \(\dfrac{8}{3}\)
\(x\) = \(\dfrac{119}{32}\)
x - 5 = 6
x = 6 + 5
x = 11
7 + x + 3 = 12
7 + x = 12 - 3
7 + x = 9
x = 9 - 7
x = 2
Mk ghi luôn chách làm
Phá ngoặc ra dc
-12x+60+21-7x=5
-19x+81=5
-19x=5-81
-19x=-86
x=(-86):(-19)=4
Ủng hộ mk nha
-12.(x-5)+7.(3-x)=5
-12x-60+21-7x=5
(-12x-7x)-(60+21)=5
-19x-81=5
-19x=5-81
-19x=-76
x=-76:(-19)
x=4
x=
x=44:(-19)
\(-12\left(x-5\right)+7\left(3-x\right)=5\)
\(60-12x+21-7x=5\)
\(81-19x=5\)
\(19x=81-5\)
\(19x=76\)
\(x=4\)