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a) \(23,45+x=76,986\)
\(\Rightarrow x=76,986-23,45\)
\(\Rightarrow x=53,536\)
Vậy x = 53,536
b) \(4567-x=291,378\)
\(\Rightarrow x=4567-291,378\)
\(\Rightarrow x=4275,622\)
Vậy x = 4275,622
_Chúc bạn học tốt_
a) 23,45 + X = 76,986
X = 76,986 - 23,45
X = 53,536
b) 4567 - x = 291,378
X = 4567 - 291,378
X = 4275,622
A = 38,27 x 2,5 + 23,45 x 19 - 1,25 + 19 x 1,55
A = 95,675 + 445,55 - 1,25 + 29,45
A = 569,425
a)1,79 x 3 + 1,79 x 6 + 1,79
=1,79 x (3 + 6 +1)
=1,79 x 10
=17,9
b)
19,94 x 11,1 - 19,94 x 0,1 + 1000
=19,94 x (11,1 - 0,1) + 1000
=19,94 x 11 + 1000
=219,34 + 1000
=1219,34
c)
21,22 x 110,5 - 21,22 x 10 - 21,22 x 0,5
=21,22 x (110,5 - 10 - 0,5)
=21,22 x 100
=2122
d)
23,45 : 12,5 : 0,6
=23,45 : (12,5 x 0,6)
=23,45 : 7,5
=3,12
a) \(210:x=2,1:0,25=8,4\)
\(x=210:8,4=25\)
b) \(x.2+x.0,5=6,25\)
\(2,5x=6,25\)
\(x=6,25:2,5=2,5\)
c) \(x:0,25-x=15,6\)
\(3x=15,6\)
\(x=5,2\)
d) \(x:12,5=3,75.4=15\)
\(x=15.12,5=187,5\)
e) \(x.12,6-x.5,6=42\)
\(7x=42\)
\(x=6\)
g) \(x:0,1-x:4-x.0,75=2,25\)
\(10x-\dfrac{x}{4}-\dfrac{3x}{4}=2,25\)
\(9x=2,25\)
\(x=0,25\)
\(\left(126,74\times126,72+18,63:0,9\right)\times\left(126-12,6:0,125-12,6\times2\right)\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-\left(12,6:0,125+12,6\times2\right)\right]\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-\left(12,6\times8+12,6\times2\right)\right]\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left\{126-\left[12,6\times\left(8+2\right)\right]\right\}\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left[126-(12,6\times10)\right]\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times\left(126-126\right)\)
\(=\left(126,74\times126,72+18,63:0,9\right)\times0\)
\(=0\)
a) x – 235,478 = 124,53 x 2
x – 235,478 = 249.06
x = 249,06 + 235,478
x = 484.538
b) 1772,82 : x = 23,45 x 12,6
1772,82 : x = 295.47
x = 1772,82 : 295,47
x= 6