440 2. 125 x 546
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TM
1
21 tháng 11 2021
2 . (125 - x) = 546 - 440
2. (125 - x) = 106
(125 - x) = 106 : 2
125 - x = 53
x = 125 - 53
x = 72
TT
6
7 tháng 7 2017
440 + 2 . ( 125 - x ) = 546
2 . ( 125 - x ) = 546 - 440
2 . ( 125 - x ) = 106
125 - x = 106 : 2
125 - x = 53
x = 125 - 53
x = 72
Vậy x = 72
7 tháng 7 2017
440 + 2. ( 125 - x ) = 546
2 ( 125 - x ) = 546 - 440
2 ( 125 - x ) = 106
125 - x = 106 ÷ 2
125 - x = 53
x = 125 - 53
x = 72
CF
3
13 tháng 9 2017
( 6x - 18 ) : 3 + 25 . 2 = 78
( 6x - 18 ) : 3 + 50 = 78
( 6x - 18 ) : 3 = 78 - 50
( 6x - 18 ) : 3 = 28
( 6x - 18 ) = 28 . 3
( 6x - 18 ) = 84
6x = 84 + 18
6x = 102
x = 102 : 6
x = 17
Vậy x = 17
GN
1
16 tháng 11 2016
\(27-3\left(x+2\right)=6\)
\(3\left(x+2\right)=27-6\)
\(3\left(x+2\right)=21\)
\(x+2=21:3\)
\(x+2=7\)
\(x=7-2\)
\(x=5\)
\(70-5\left(x-3\right)=45\)
\(5\left(x-3\right)=70-45\)
\(5\left(x-3\right)=25\)
\(x-3=25:5\)
\(x-3=5\)
\(x=5+3\)
\(x=8\)
\(10+2x=4^5:4^3\)
\(10+2x=16\)
\(2x=16-10\)
\(2x=6\)
\(x=3\)
\(440+2\left(125-x\right)=546\)
\(2\left(125-x\right)=546-440\)
\(2\left(125-x\right)=106\)
\(125-x=106:2\)
\(125-x=53\)
\(x=125-53\)
\(x=72\)
k nha
HT
4 tháng 7 2018
a, 440 + 2 . (125 - x) = 546
2 . (125 - x) = 546 - 440
2 . (125 - x) = 106
125 - x = 106 : 2
125 - x = 53
x = 125 - 53
x = 72
10 tháng 11 2017
a/ 440 + 2 [ 125 - x ] = 546
==> 2 [ 125 - x ] = 546 - 440
==> 2 [ 125 - x ] 106
==> 125 - x = 106 : 2
==> 125 - x = 53 ==> x = 125 - 53 =72
b/ 7x - 33 = 27 : 24
==> 7x - 27 = 27-4 = 23 = 8
==> 7x = 8+ 27
==> 7x = 35 ==> x = 35 : 7 = 5
c/ [ 12x - 43 ] . 83 = 4 . 84
==> [ 12x - 26 ] . 29 = 22 . 212
==> [ 12x - 26 ] . 29 = 214
==> [ 12x - 26 ] = 214 : 29 = 25
==>. 12x = 25 + 26 = 96
==> x = 96 : 12 = 8
d/ 123 - 5. [ x + 4 ] = 38
==> 5. [ x + 4 ] = 123 - 38
==> 5. [ x + 4 ] = 85
==> x + 4 = 85 : 5
==> x + 4 = 17
==> x = 17 - 4 = 13
e/ [ 2600 + 6400 ] - 3.x = 1200
==> 9000 - 3x = 1200
==> 3x = 9000 -1200 = 7800
==> x = 7800 : 3 = 2600
f/ x2 - 72 : 36 = 23
==> x2 - 2 = 23
==> x2 = 23 + 2
==>x2 = 25
==> x2 = 52
==> x = 5
TN
31 tháng 12 2016
455 / x +546 / x - 1 /x =125 (nhân x vào)
455x / x + 546x / x - x / x =125x
455 + 546 -1 = 125x
125x = 1000
x = 8
KN
23 tháng 2 2019
\(\frac{455}{x}+\frac{546}{x}-\frac{1}{x}=125\)
\(\Leftrightarrow\frac{455+546-1}{x}=125\)
\(\Leftrightarrow\frac{1000}{x}=125\)
\(\Leftrightarrow x=\frac{1000}{125}\)
\(\Leftrightarrow x=8\)
Vậy x = 8
9 tháng 9 2023
a) \(544+362-89\\ =906-89\\ =817\)
b) \(546-422=124\)
c) \(472-125+49\\ =347+49\\ =396\)
VN
Võ Ngọc Phương
VIP
31 tháng 10 2023
1.
a) \(125+80+375+220\)
\(=\left(125+375\right)+\left(80+220\right)\)
\(=500+300\)
\(=800\)
b) \(25.11.8.4.125\)
\(=\left(25.4\right).\left(8.125\right).11\)
\(=100.1000.11\)
\(=1100000\)
c) \(18.74+18.27-18\)
\(=18.\left(74+27-1\right)\)
\(=18.100\)
\(=1800\)
d) \(75.23+75.77-500\)
\(=75.\left(23+77\right)-500\)
\(=75.100-500\)
\(=7500-500\)
\(=7000\)
e) \(150:\left[25.\left(18-4^2\right)\right]\)
\(=150:\left[25.\left(18-16\right)\right]\)
\(=150:\left[25.2\right]\)
\(=150:50\)
\(=3\)
f) \(125.23.2.8.50\)
\(=\left(125.8\right).\left(2.50\right).23\)
\(=1000.100.23\)
\(=2300000\)
g) \(235+88+165+12\)
\(=\left(235+165\right)+\left(88+12\right)\)
\(=400+100\)
\(=500\)
h) \(71.32+71.68-1100\)
\(=71.\left(32+68\right)-1100\)
\(=71.100-1100\)
\(=7100-1100\)
\(=6000\)
i) \(6^7:6^6+4^3.2-24^0\)
\(=6+64.2-1\)
\(=6+128-1\)
\(=133\)
j) \(546-6.\left[158:\left(30+7^2\right)\right]\)
\(=546-6.\left[158:\left(30+49\right)\right]\)
\(=546-6.\left[158:79\right]\)
\(=546-6.2\)
\(=546-12\)
\(=534\)
k) \(268+147+132+253\)
\(=\left(268+132\right)+\left(147+253\right)\)
\(=400+400\)
\(=800\)
VN
Võ Ngọc Phương
VIP
31 tháng 10 2023
2.
a) \(7x=707\)
\(x=707:7\)
\(x=101\)
b) \(6x+5=47\)
\(6x=47-5\)
\(6x=42\)
\(x=42:6\)
\(x=7\)
c) \(35:\left(x+1\right)=7\)
\(x+1=35:7\)
\(x+1=5\)
\(x=5-1\)
\(x=4\)
d) \(12+\left(29-3x\right)=35\)
\(29-3x=35-12\)
\(29-3x=23\)
\(3x=29-23\)
\(3x=6\)
\(x=6:3\)
\(x=2\)
e) \(2.4^x+10^1=138\)
\(2.4^x=138-10\)
\(2.4^x=128\)
\(4^x=128:2\)
\(4^x=64=4^3\)
\(\Rightarrow x=3\)
f) \(7x=140\)
\(x=140:7\)
\(x=20\)
g) \(7\left(15-x\right)+14=84\)
\(7\left(15-x\right)=84-14\)
\(7\left(15-x\right)=70\)
\(15-x=70:7\)
\(15-x=10\)
\(x=15-10\)
\(x=5\)
h) \(3^x.5-15=390\)
\(3^x.5=390+15\)
\(3^x.5=405\)
\(3^x=405:5\)
\(3^x=81=3^4\)
\(\Rightarrow x=4\)
VT
2
17 tháng 1 2018
a)[25+(-15)]
=+10
b)512-(-88)-440-125
=512+88-440-125
=600-440-125
=160-125
=35
c)310+(-210)-907+107
=100-907+107
=-807+107
=-700