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200 - 18 : (372 : x - 1) - 28 = 166
200 - 18 : (372 : x - 1) = 166 + 28
200 - 18 : (372 : x - 1) = 194
18 : (372 : x - 1) = 200 - 194
18 : (372 : x - 1) = 6
372 : x - 1 = 18 : 6
372 : x - 1 = 3
372 : x = 3 + 1
372 : x = 4
x = 372 : 4
x = 93
\(200-18:\left(272:x-1\right)-28=166\)
\(-18:\left(272:x-1\right)=-6\)
\(272:x-1=3\)
\(272:x=4\)
\(x=93\)
\(\Leftrightarrow18:\left[124:x-1\right]=6\)
\(\Leftrightarrow124:x-1=3\)
hay x=31
\(\Leftrightarrow18:\left[124:x-1\right]=6\)
\(\Leftrightarrow124:x-1=3\)
\(\Leftrightarrow x=31\)
a. 420 : (x : 39) = 105
x : 39 = 420 : 105
x : 39 = 4
x = 4 x 39
x = 156
b. 200 - 18 : (372 : 3 : x - 1) - 28 = 166
200 - 28 - 166 = 18 : (372 : 3 : x - 1)
6 = 18 : (124 : x - 1)
18 : (124 : x - 1) = 6
124 : x - 1 = 18 : 6
124 : x - 1 = 3
124 : x = 4
x = 124 : 4
x = 31
c. 429 : (x + 31) = 11
x + 31 = 429 : 11
x + 31 = 39
x = 39 - 31
x = 8
d. 1615 : (X x 19) = 17
X x 19 = 1615 : 17
X x 19 = 95
X = 95 : 19
X = 5
cho mình xin tick nhé !
a: 420:(x:39)=105
=>\(x:39=420:105=4\)
=>\(x=4\times39=156\)
b: \(200-18:\left(372:3:x-1\right)-28=166\)
=>\(172-18:\left(124:x-1\right)=166\)
=>\(18:\left(124:x-1\right)=172-166=6\)
=>\(124:x-1=18:6=3\)
=>\(124:x=3+1=4\)
=>\(x=\frac{124}{4}=31\)
c: \(429:\left(x+31\right)=11\)
=>x+31=429:11=39
=>x=39-31=8
d: \(1615:\left(x\times19\right)=17\)
=>\(x\times19=1615:17=95\)
=>x=95:19=5
#)Giải :
\(200-18:\left(372:3x-1\right)-28=166\)
\(\Leftrightarrow200-18:\left(372:3x-1\right)=194\)
\(\Leftrightarrow18:\left(372:3x-1\right)=6\)
\(\Leftrightarrow372:3x-1=3\)
\(\Leftrightarrow3x-1=124\)
\(\Leftrightarrow3x=125\)
\(\Leftrightarrow x=\frac{125}{3}\)
200 - 18 : (372 : 3 . x - 1) - 28 = 166
=> 200 - 18 : (372 : 3.x - 1) = 166 + 28
=> 200 - 18 : (372 : 3.x) - 1) = 194
=> 18 : (372 : 3.x - 1) = 200 - 194
=> 18 : (372 : 3.x - 1) = 6
=> 372 : 3.x - 1 = 18 : 6
=> 372 : 3.x - 1 = 3
=> 372 : 3.x = 3 + 1
=> 372 : 3.x = 4
=> 3.x = 372 : 4
=> 3.x = 93
=> x = 93 : 3
=> x = 31
200-18:(372:3xy-1)-28=166
=> 200 - 18 : ( 126 x y -1 ) - 28 = 166
=> 200 - 18 : ( 126 x y -1) = 166 + 28 = 194
=> 18 : ( 126 x y - 1) = 200 -194 = 6
=> 126 x y - 1 = 18 : 6 = 3
=> 126 x y = 3 +1 = 4
=> y = 4 : 126
=> y = 2/63
200-18:(372:3xy-1)-28=166
=> 200 - 18 : ( 126 x y -1 ) - 28 = 166
=> 200 - 18 : ( 126 x y -1) = 166 + 28 = 194
=> 18 : ( 126 x y - 1) = 200 -194 = 6
=> 126 x y - 1 = 18 : 6 = 3
=> 126 x y = 3 +1 = 4
=> y = 4 : 126
=> y = 2/63
200-18:(372:3.X-1)-28=166
200-18:(372:3.X-1) =166+28
200-18:(372:3.X-1) =194
200-18:(124.X-1) =194
18:(124.X-1) =200-194
18:(124.X-1) =6
124.X-1 =18:6
124.X-1 =3
124.X =3+1
124.X =4
X =4:124
X =1/31 .
200 - 18 : ( 372 : 3 : x - 1 ) - 28 = 166
=> 200 - 18 : ( 124 : x - 1 ) - 28 = 166
=> 200 - 28 - 18 : ( 124 : x - 1) = 166
=> 172 - 18 : (124 : x - 1) = 166
=> 18 : (124 : x - 1) = 172 - 166 = 6
=> 124 : x - 1 = 18 : 6 = 3
=> 124 : x = 3 + 1 = 4
=> x = 124 : 4 = 31
Bài làm
200 - 18 : ( 372 : 3 : x - 1 ) - 28 = 166
200 - 18 : ( 124 : x - 1 ) - 28 = 166
172 - 18 : ( 124 : x - 1 ) = 166
18 : ( 124 : x - 1 ) = 6
( 124 : x - 1 ) = 18 : 6
124 : x - 1 = 3
124 : x = 4
x = 31
Vậy x = 31
# Học tốt #