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420+65.4=(x+175):5+30
=> 420 + 260 = ( x + 175 ) : 5 + 30
=> 680 = ( x + 175 ) : 5 + 30 <=> ( x + 175 ) : 5 + 30 = 680
=> ( x + 175 ) : 5 = 650
=> x + 175 = 3250
=> x = 3075
420+65.4=(X+175):5+30
=>420+260=(X+175):5+30
=>680=(X+175):5+30
=>680-30=(X+175):5
=>650=(X+175):5
=>650.5=X+175
=>3250=X+175
=>X=3250-175
=>X=3075
x - 4867 = (175.2050.70):25 + 24
x - 4867 = 251125:25 + 24
x - 4867 = 1004500 +24
x = 1004500 + 24 + 4867
x = 1009391
a) 420 + 65.4 = (x+175):5+30 b) x - 4867 = (175.2050.70):25+23
(x+175):5+30 = 420 + 65.4 x - 4867 = 1004523
(x+175):5+30 = 680 x = 999656
(x+175):5 = 650
x+175 = 3250
x = 3075
\(a,\Rightarrow6x+70=130\Rightarrow6x=60\Rightarrow x=10\\ b,\Rightarrow240=\left(x+70\right):14-40\\ \Rightarrow\left(x+70\right):14=280\\ \Rightarrow x+70=3920\Rightarrow x=3850\\ c,\Rightarrow x-15=75\Rightarrow x=90\\ d,\Rightarrow\left(x+175\right):5=680-30=650\\ \Rightarrow x+175=3250\Rightarrow x=3075\\ e,\Rightarrow x-4867=1004523\Rightarrow x=1009390\\ f,\Rightarrow x+32-17=24\Rightarrow x=9\\ g,\Rightarrow3\left(x+1\right)=54\Rightarrow x+1=18\Rightarrow x=17\\ h,\Rightarrow19\left(35:x+3\right)=152\\ \Rightarrow35:x+3=8\Rightarrow35:x=11\Rightarrow x=\dfrac{35}{11}\)
a) 3636:(12x-91) =36
12x-91 = 3636:36
12x-91=101
12x=101+91
12x=192
x=192:12
x=16
b) (x : 23+45).67=8911
(x : 23+45)=8911:67
(x : 23+45)=133
x:23=133-45
x:23=88
x=88.23
x=2024
c) 420+65.4 =(x+175):5+30
420+260=(x+175):5+30
680=(x+175):5+30
(x+175):5=680-30
(x+175):5=650
(x+175)=650x5
(x+175)=3250
x=3250-175
x=3075
d) (32.15):2=(x+70):14-10
480:2=(x+70):14-10
240=(x+70):14-10
(x+70):14=240+10
(x+70):14=250
(x+70)=250.14
(x+70)=3500
x=3500-70
x=3430
e)x-4867=(175.2-50.70):25+23
x-4867=(350-3500):25+23
x-4867=-3150:25+23
x-4867=-126+23
x-4867=-103
x=-103+4867
x=4764
\(1) 420+65.4=(x+175):5+30\)
\(\implies 420+260=(x+175):5+30\)
\(\implies 680=(x+175):5+30\)
\(\implies 650=(x+175):5\)
\(\implies 650.5-175=x\)
\(\implies 3075=x\)
\(2)x-4867=(175.2050.70):25+23\)
\(\implies x-4867=1004500+23\)
\(\implies x-4867=1004523\)
\(\implies x=1009390\)
\(3) 134-[(96-7x):4-2]=126\)
\(\implies (96-7x):4-2=8\)
\(\implies(96-7x):4=10\)
\(\implies 96-7x=40\)
\(\implies 7x=56\)
\(\implies x=8\)
\(4) 4-\{100-[(100-5x):8-5]:10\}:25=0\)
\(\implies 4-\{100-[(100-5x):8-5]:10\}=0\)
\(\implies 100-[(100-5x):8-5]:10=4\)
\(\implies 100-[(100-5x):8-5]=40\)
\(\implies (100-5x):8-5=60\)
\(\implies (100-5x):8=65\)
\(\implies 100-5x=520\)
\(\implies 5x=-420\)
\(\implies x=-84\)
~ Hok tốt a~
( X + 175 ) : 5 + 30 =420 + 65 x 4
( X + 175 ) : 5 + 30 = 680
( X + 175 ) : 5 = 680 - 30 = 650
( X + 175 ) = 650 x 5 = 3250
X = 3250 - 175 = 3075
( X + 175 ) : 5 + 30 = 420 + 65 x 4
( X + 175 ) : 5 + 30 = 420 + 260
( X + 175 ) : 5 + 30 = 680
( X + 175 ) : 5=680-30
( X + 175 ) : 5=650
X + 175=650x5
X + 175=3250
X=3250-175
X=3075
420 + 65 x 4 = ( x + 175 ) : 5 + 30
( x + 175 ) : 5 + 30 = 420 + 65 x 4
( x + 175 ) : 5 + 30 = 420 + 260
( x + 175 ) : 5 + 30 = 680
( x + 175 ) : 5 = 680 - 30
( x + 175 ) : 5 = 650
x + 175 = 650 x 5
x + 175 = 3250
x = 3250 - 175
x = 3075
420 + 65.4 = (x + 175):5 +30
=> 420 + 260 = ( x + 175 ) : 5 + 30
=> 680 - 30 = ( x + 175 ) : 5
=> 650 = ( x + 175 ) : 5
=> x + 175 = 3250
=> x = 3075
a) 420+65x4=(x+175):5+30
420+260=(x+175):5+30
680=(x+175):5+30
680-30=(x+175):5
650=(x+175):5
650x5=x+175
3250=x+175
x=3250-175
x=3075