112.5-5.5=.........
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VN
8 tháng 3 2017
\(\frac{x}{2}+x=112,5\)
\(\frac{x+2x}{2}=112,5\)
\(\frac{3x}{2}=112,5\)
\(\Rightarrow3x=112,5\times2\)
\(3x=225\Rightarrow x=225:3=75\)
8 tháng 3 2017
\(x:2+x=112.5\)
\(x:2+x=560\)
\(x.\frac{1}{2}+x=560\)
\(x.\left(\frac{1}{2}+1\right)=560\)
\(x.\frac{3}{2}=560\)
\(x=560:\frac{3}{2}\)
\(x=\frac{1120}{3}\)
NT
4
DH
20 tháng 6 2017
a, \(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)
\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)
\(=6-1,3=4,7\)
b, \(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)
\(=\left(-4,9+4,9\right)+\left(5,5-5,5\right)\)
\(=0+0=0\)
Chúc bạn học tốt!!!
20 tháng 6 2017
a, 6.3+(-3.7)+2.4+(-0.3) = (6,3 - 0,3) + (-3,7+2,4) = 6 - 1,3 = 4,7
b, (-4.9)+5.5+4.9+(-5.5) = (-4,9 +4,9) + (-5,5 + 5,5) = 0 + 0 = 0
LA
2
DP
12 tháng 3 2017
1/2 Số thứ nhất = 1/3 số thứ 2
=> Số thứ nhất chiếm 2 phần , số thứ 2 chiếm 3 phần
Số thứ nhất là
112,5 : ( 3 + 2 ) x 2 = 45
Đáp số : 45
PT
4
Bài 5.5 ạ
28 tháng 6 2017
a;Zn + 2HCl\(\rightarrow\)ZnCl2+H2
Zn+ H2SO4\(\rightarrow\)ZnSO4+H2
b;TN1:
\(\sum n_{H_2}=0,1+0,1=0,2\left(mol\right)\)
VH2=22,4.0,2=4,48(lít)
TN2:
\(\sum n_{H_2}=0,1+0,05=0,15\left(mol\right)\)
VH2=22,4.0,15=3,36(lít)
Vậy ở TN1 sinh ra nhiều H2 hơn
DN
0
LT
1
NN
5 tháng 9 2016
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