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a) (y – 1) : 105 = 125 x 80
(y – 1) : 105 = 10000
(y – 1) = 10000 x 105
(y – 1) = 1050000
y = 1050000 + 1
y = 1050001
b) (y – 607 200) : 305 = 642 + 318
(y – 607 200) : 305 = 960
(y – 607 200) = 960 x 305
(y – 607 200) = 292800
y = 292800 + 607 200
y = 900000
\(a.\left(y-1\right):105=125x80\) \(b.\left(y-607200\right):305=642+318\)
\(\left(y-1\right):105=10000\) \(\left(y-607200\right):305=960\)
\(y-1=10000x105=1050000\) \(y=960+607200=608160\)
\(y=1050000+1=1050001\)
\(c.\left(1780-973\right)x\left(75:y\right)=2401+20\)
\(807x\left(75:y\right)=2401+20\)
\(807x\left(75:y\right)=2421\)
\(75:y=2421:807=3\)
\(y=75:3=25\)
a: \(13329:x=3\)
=>\(x=\dfrac{13329}{3}=4443\)
b: x:8=5678
=>\(x=5678\cdot8=45424\)
a, \(\Leftrightarrow x=1-\dfrac{2}{9}=\dfrac{7}{9}\)
b, \(\Leftrightarrow x=\dfrac{22.7}{11}=2.7=14\)
vì A+A+A+A=76
Suy ra A= 76:4
A=19
B=475:19
B=25
C=5700:475
C=12
D=159600:5700
D=28
Suy ra E=159623-159600
E=23
Vậy A=19
B=25
C=12
D=28
E=23
a) 7210 : X + 356 = 391 b) 9000 - 120 x X = 4680
7210 : X = 391 - 356 120 x X = 9000 - 4680
7210 : X = 35 120 x X = 4320
X = 7210 : 35 X = 4320 : 120
X = 206 X = 36
c) 1230 - X - 108 = 870 d) 108 720 : X = 151 x 2
X - 108 = 1230 - 870 108 720 : X = 302
X - 108 = 360 X = 108 720 : 302
X = 360 + 108 X = 360
X = 468
/HT\
a) 7210 : X + 356 = 391
\(7210:x=391-356\)
\(7210:x=35\)
\(x=7210:35\)
\(x=206\)
b) 9000 - 120 x X = 4680
\(120.x=9000-4680\)
\(120.x=4320\)
\(x=4320:120\)
\(x=36\)
c) 1230 - X - 108 = 870
\(1230-x=870+108\)
\(x=1230-978\)
\(x=252\)
d) 108 720 : X = 151 x 2
\(x=108720:151.2\)
\(x=720.2\)
\(x=1440\)
("." là dấu nhân)
\(a,\Rightarrow x\times\left(42+54+4\right)=25400\\ \Rightarrow x\times100=25400\\ \Rightarrow x=254\\ b,\Rightarrow x\times\left(142-41-1\right)=40800\\ \Rightarrow x\times100=40800\\ \Rightarrow x=408\)
a) \(x\)(42+54+4)=15400 b) (142-41-1)\(x\)=10800
\(x\)x100=15400 100x\(x\)=10800
\(x\)=15400:100 \(x\)=10800:100
\(x\)=154 \(x\)=108
a=4
b=20
c=9
kb nha
Vì a x b = 80 nên a = 80/b
b x c = 180 nên c = 180/b
Theo đề, a x b x c = 720
Hay \(\frac{80}{b}\times b\times\frac{180}{b}=720\)
80 x 180 = 720 x b
14400 = 720 x b
b = 14400/720 = 20
Vậy a = 80/b = 80/20 = 4
c = 180/b = 180/20 = 9