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a) X + 1/4 = 5/8 + 2/5
X + 1/4 = 41/10
X = 41/10 - 1/4
X = 31/40
b) X : 3/4 = 4/10 - 4/10
X : 3/4 = 0
X = 0
c) X + 3,4 x 2,6 = 4,8 x 5,2
X + 8,84 = 24,96
X = 24,96 : 8,84
X = 48/17
d) X : 1,5 + 1,5 = 0,8N x 2
= bó tay nhé
5.7*16.2+16.2*4.3-6.2*4.8+6.2*5.2=(5.7*16.2+16.2*4.3)-(6.2*4.8+6.2*5.2)=16.2(5.7+4.3)-6.2(4.8+5.2)=16.2*10+6.2*10=10(16.2-6.2)=10
13.4+12.3+11.2+10.4-11.5-12.6-0.4=(13.4+12.3+11.2+10.4)-(11.5+12.6+0.4)=47.3-24.5=22.8
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1)
a) 40% x X + X x 1/2 = 72
0,4 x X + X x 0,5 = 72
X x (0,4 + 0,5) = 72
X x 0,9 = 72
X = 72 : 0,9
X = 80
b) X x 2 + X : 0,125 = 55
X x 2 + X x 8 = 55
X x (2 + 8) = 55
X x 10 = 55
X = 55 : 10
X = 5,5
2.
a) 160 x (X - 17,4) = 2912
X - 17,4 = 2912 : 160
X - 17,4 = 18,2
X = 18,2 + 17,4
X = 35,6
b) X x 4,8 + 5,2 x X = 25,6
X x (4,8 + 5,2) = 25,6
X x 10 = 25,6
X = 25,6 : 10
X = 2,56
\(x+4,5\times2=86,2\)
\(x+9=86,2\)
\(x=86,2-9\)
\(x=77,2.\)
\(x\times5,2+4,8=10\)
\(x\times5,2=10-4,8\)
\(x\times5,2=5,2\)
\(x=5,2:5,2\)
\(x=1.\)
\(a.5,2\times9+5,2=5,2\times\left(9+1\right)=5,2\times10=52\)
\(b.12,3\times101-12,3=12,3\times\left(101-1\right)=12,3\times100=1230\)
\(c.1,25\times0,25\times2,3\times4\times8\times11=\left(1,25\times8\right)\times\left(0,25\times4\right)\times2,3\times11=10\times1\times25,3=253\)
a , 5,2 . 9 + 5,2
= 5,2 . 9 + 5,2 . 1
= 5,2 . ( 9 + 1 )
= 5,2 . 10
= 52 .
b , 12,3 . 101 - 12,3
= 12,3 . 101 - 12,3 . 1
= 12,3 . ( 101 - 1 )
= 12,3 . 100
= 1230 .
c , 1,25 . 0,25 . 2,3 . 4 . 8 . 11
= ( 1,25 . 8 ) . ( 0,25 . 4 ) . ( 2,3 . 11 )
= 10 . 1 . 25,3
= 10 . 25,3
= 253 .
Hok tốt :))
\(x\times5,2+x\times4,8=25\\ \Rightarrow x\left(5,2+4,8\right)=25\\ \Rightarrow10x=25\\ \Rightarrow x=\dfrac{25}{10}=\dfrac{5}{2}\)
Vậy \(x=\dfrac{5}{2}\)
\(X\times\left(5,2+4,8\right)=25\)
\(X\times10=25\)
=> \(X=\dfrac{25}{10}=2,5\)
dễ thì tự suy nghĩ sẽ tốt hơn
A) X x 19,02 - 19,01 x X = 56,84
X x (19,02 - 19,01) = 56,84
X x 0,01 = 56,84
X = 56,84 : 0,01
X = 5684
B) 4,8 x X + X x 5,2 = 19,2
(4,8 + 5,2) x X = 19,2
10 x X = 19,2
X = 19,2 : 10
X = 1,92
A) X x (19,02 - 19,01 ) = 56,84
X x 0.01 = 56,84
X = 56,84 : 0,01
X = 5,684
Vậy X = 5,684
B) X x (4,8+ 5,2) = 19,2
X x 10 = 19,2
X = 19,2 : 10
X = 1,92
Vậy X = 1,92