x nhân 9.25 + 75% nhan x =55.35
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X x 4 + x = 55 .35
X x ( 4 + 1 ) = 55 x 35
X x 5 = 55 x 35
X = 55 x 35 : 5
X = 55 x 7
X = 385
a) X x 4 +X x 1= 55.35 b)X x 3 + X : 0,5 + X : 0,25 + X = 2018
X x 5=55.35 X x 3 + X x 2 + X x 4 + X x 1 = 2018
X = 55.35 : 5 X x ( 3 + 2 + 4 + 1) =2018
X =11.07 X x 10 = 2018
X = 2018 : 10
X = 201,8
a) X x4 +X=55 x35
Xx(4+1)=1925
Xx5 =1925
X =1925:5
X =385
mình bận xíu tí làm tiếp
\(\text{- ( 2789 _ 435 ) + ( 1789 _ 1435 )}\)
\(=-2789+435+1789-1435\)
\(=\left(-2789+1789\right)+\left(435-1435\right)\)
\(=-1000+-1000\)
\(=-2000\)
\(=-\left(-2010\right)+36.41-36.\left(-59\right)\)
\(=2010+36.\left(41+59\right)\)
\(=2010+36.100\)
\(=2010+3600\)
\(=5610\)
\(-75.\left(18-65\right)-65.\left(75-18\right)\)
\(=-75.18+75.65-65.75+65.18\)
\(=18.\left(-75+65\right)+75.\left(65-65\right)\)
\(=18.\left(-10\right)+75.0\)
\(=-180\)
\(-15:x=3\)
\(x=-15:3\)
\(x=-5\)
\(-3x+8=7\)
\(-3x=-1\)
\(x=\frac{1}{3}\)
\(\left(x-6\right).\left(7-x\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-6=0\\7-x=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=6\\x=7\end{cases}}}\)
\(\Rightarrow x\in\left\{6;7\right\}\)
\(2.\left(x-3\right)-3.\left(x-5\right)=4.\left(3-x\right)-18\)
\(2x-6-3x+15=12-4x-18\)
\(2x-3x+4x=12-18-15+6\)
\(3x=-15\)
\(\Rightarrow x=-5\)
\(-a.\left(c-d\right)-d.\left(a+c\right)=-c.\left(a+d\right)\)
\(-a.c+a.d-d.a+-d.c=-c.\left(a+d\right)\)
\(-c.\left(a+d\right)+a.\left(d-d\right)=-c.\left(a+d\right)\)
\(-c.\left(a+d\right)+a.0=-c.\left(a+d\right)\)
\(\Rightarrow-c.\left(a+d\right)=-c.\left(a+d\right)\)
(3a+2).(2a–1)+(3–a).(6a+2)–17.(a–1)
=6a²−3a+4a−2+18a+6−6a²−2a−17a+17
=(6a²−6a²)+(−3a+4a+18a−2a−17a)+(17−2+6)
=0+0+21
=21
học tốt
\(3^x.5^x=9.25\)
\(\Rightarrow3^x.5^x=3^2.5^2\)
\(\Rightarrow\left(3.5\right)^x=\left(3.5\right)^2\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
\(75-5.\left(2x-8\right)=15\)
\(5.\left(2x-8\right)=75-15\)
\(5.\left(2x-8\right)=5=60\)
\(2x-8=60:5\)
\(2x-8=12\)
\(2x=12+8\)
\(2x=20\)
\(x=20:2\)
\(x=10\)
Học tốt
\(75-5\left(2x-8\right)=15\)
\(\Rightarrow5\left(2x-8\right)=60\)
\(\Rightarrow2x-8=12\)
\(\Rightarrow2x=20\)
\(\Rightarrow x=10\)
x.(9,25+75%)=55,35
x.(9,25+3/4)=55,35
x.(9,25+3/4)=1925
x.40/4=1925
x.10/1=1925
x=1925:10/1
x=192,5