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\(-\dfrac{3}{10}-0,125+-\dfrac{7}{10}+1,125\)
`=`\(\left(-\dfrac{7}{10}-\dfrac{3}{10}\right)+\left(-0,125+1,125\right)\)
`= -1 + 1=0`
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a)
\(\begin{array}{l}\frac{{ - 3}}{{10}} - 0,125 + \frac{{ - 7}}{{10}} + 1,125 \\= \left( {\frac{{ - 3}}{{10}} + \frac{{ - 7}}{{10}}} \right) + \left( {1,125 - 0,125} \right)\\ = - 1 + 1 \\= 0\end{array}\)
b)
\(\begin{array}{l}\frac{{ - 8}}{3}.\frac{2}{{11}} - \frac{8}{3}:\frac{{11}}{9} \\= \frac{8}{3}.\frac{{ - 2}}{{11}} - \frac{8}{3}.\frac{9}{{11}}\\ = \frac{8}{3}.\left( {\frac{{ - 2}}{{11}} - \frac{9}{{11}}} \right)\\ =\frac{{ - 8}}{3}.\frac{-11}{11}\\= \frac{8}{3}.\left( { - 1} \right) \\= \frac{{ - 8}}{3}\end{array}\)
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\(=\frac{\left(-1\right)^7}{3^7}.3^7+\left(\frac{1}{8}\right)^3.8^3+\left(\frac{1}{5}\right)^3.\left(2.5\right)^3\)
\(=\left(-1\right)^7+\frac{1^3}{8^3}.8^3+\frac{1^3}{5^3}.2^3.5^3\)
\(=-1+1+2^3=2^3=8\)
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4^2.4^3/2^10=(2^2)^2/(2^2)^10=2^4/2^20=1/2^16
Nho cho minh nhe
Yen tam minh hoc roi khong sai dau
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\(\Rightarrow A=\frac{\frac{1}{2}-\frac{1}{5}+\frac{1}{7}}{\frac{3}{8}-\frac{3}{5}+\frac{3}{7}}+\frac{\frac{1}{2}+\frac{1}{3}-\frac{1}{5}}{\frac{3}{4}+\frac{1}{2}+\frac{3}{10}}\)
\(\Rightarrow A=\frac{\frac{1}{2}-\frac{1}{5}+\frac{1}{7}}{3.\left(\frac{1}{2}-\frac{1}{5}+\frac{1}{7}\right)}+\frac{\frac{1}{2}+\frac{1}{3}-\frac{1}{5}}{\frac{3}{2}.\left(\frac{1}{2}+\frac{1}{3}-\frac{1}{5}\right)}\)
\(\Rightarrow A=\frac{1}{3}+\frac{2}{3}\)
\(\Rightarrow A=1\)
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Theo đề : Ta có : 1 .2 + 2.3 + 3.1 + a . 6 + 5.3 + 6.1 +7.4 + 8.2 + 9.1 +10 .2 / 25 = 5,16
=> 1 .2 + 2.3 + 3.1 + a . 6 + 5.3 + 6.1 +7.4 + 8.2 + 9.1 +10 .2 = 5,16 . 25
=> 1 .2 + 2.3 + 3.1 + a . 6 + 5.3 + 6.1 +7.4 + 8.2 + 9.1 +10 .2 = 129
=> a.6 + (1 .2 + 2.3 + 3.1 + 5.3 + 6.1 +7.4 + 8.2 + 9.1 +10 .2) = 129
=> a .6 + 105 = 129
=> a .6 = 129 - 105
=> a .6 = 24
=> a = 24 : 6
=> a = 4
Vậy a = 4
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https://www.facebook.com/toi.chetroi1711 add face e đi a e gửi ảnh
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a, 30,24 + 30,24 + 30,24 + 30,24 x 7 - 30,24 : 0,1
= 30,24 x 3 + 30,24 x 7 - 30,24 : 0,1
= 30,24 x 10 - 30,24 : 0,1
= 30,24 x 10 - 30,24 x 10
= 0
b, 2 giờ 30 phút x 8 + 2,5 giờ x 3 - 150 phút
= 2,5 giờ x 8 + 2,5 giờ x 3 - 150 phút
= 2,5 giờ x 8 + 2,5 giờ x 3 - 2,5 giờ
= 2,5 giờ x 10
= 25 giờ
c, 1/2 : 0,5 - 1/4 : 0,25 + 1/8 : 0,125 - 1/10 : 0,1
= 1/2 x 2 + 1/4 x 4 + 1/8 x 8 - 1/10 x 10
= 1 + 1 + 1 - 1
= 2
G = \(\dfrac{-3}{10}\) - 0,125 + \(\dfrac{-7}{10}\) + 1,125
G = -0,3 - 0,125 - 0,7 + 1,125
G = (1,125 - 0,125) - (0,3 + 0,7)
G = 1 - 1
G = 0
G = ( - \dfrac{3}{10} - \dfrac{7}{10} ) + (-0,125 + 1,125)$
$= -1 + 1$
$= 0$