5.5=
5.5+5.5
5.5:5.5
a, 6.3+(-3.7)+2.4+(-0.3)
b, (-4.9)+5.5+4.9+(-5.5)
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!!!
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
a)\(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)
\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)
\(=6+\left(-1,3\right)=4,7\)
b)\(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)
\(=\left(-4,9+4,9\right)+\left(-5,5+5,5\right)\)
\(=0+0=0\)
19.5:5.5:5.5:5=?
cho các bạn kiếm k nè
nhanh mk k cho nha
Bài 5.5 ạ!Bài 5.5 ạ
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
a) 6.3+(-3.7)+2.4+(-0.3)
b)(-4.9)+5.5+4.9+(-5.5)
c)2.9 +3.7+(-4.2)+(-2.9)+4.2
d)(-6.5).2.8+2.8.(-3.5)
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a) 6.3+(-3.7)+2.4+(-0.3)
b)(-4.9)+5.5+4.9+(-5.5)
c)2.9 +3.7+(-4.2)+(-2.9)+4.2
d)(-6.5).2.8+2.8.(-3.5)
a) 6,3 + (-3,7) + 2,4 + (-0,3)
= (6,3 + 2,4) + [-3,7 + (-0,3)]
= 8,7 + (-4)
= 4,7
b) (-4,9) + 5,5 + 4,9 + (-5,5)
= (-4,9 + 4,9) + [5,5 + (-5,5)]
= 0 + 0
= 0
c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2
= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7
= 0 + 0 + 3,7
= 3,7
d) (-6,5) . 2,8 + 2,8 . (-3,5)
= 2,8 . [-6,5 + (-3,5)]
= 2,8 . (-10)
= -28.
CHỨNG MINH RẰNG \(\frac{1}{1.2}\)+ \(\frac{1}{3.4}\)+ \(\frac{1}{5.6}\)+ .....................+ \(\frac{1}{17.18}\)> \(\frac{9}{19}\)
TÍNH \(\frac{5.5}{1.6}\)+ \(\frac{5.5}{6.11}\)+ \(\frac{5.5}{11.16}\)+ \(\frac{5.5}{16.21}\)
Ta có : \(\frac{5.5}{1.6}+\frac{5.5}{6.11}+\frac{5.5}{11.16}+\frac{5.5}{16.21}\)
\(=5\left(\frac{5}{1.6}+\frac{5}{6.11}+\frac{5}{11.16}+\frac{5}{16.21}\right)\)
\(=5\left(1-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}\right)\)
\(=5\left(1-\frac{1}{21}\right)\)
\(=5.\frac{20}{21}=\frac{100}{21}\)
5.5=