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(5 \(\times\) 13 - 45) \(\times\) \(x\) - 47 = 13
(65 - 45) \(\times\) \(x\) = 13 + 47
20 \(\times\) \(x\) = 60
\(x\) = 60 : 20
\(x\) = 3
\(\Leftrightarrow\left(65-45\right)x-47=13\)
\(\Leftrightarrow20x=13+47=60\)
\(\Leftrightarrow x=3\)
Vậy \(x=3\)
-5 + (-37 - 45 + 51) - (-37 + 51)
= -5 - 37 - 45 + 51 + 37 - 51
= - (5 + 45) - (37 - 37) + (51 - 51)
= - 50 - 0 + 0
= - 50
- (15 - 47 + 58) + (15 - 47 ) + 3
= - 15 + 47 - 58 + 15 - 47 + 3
= (-15 + 15) + (47 - 47) - (58 - 3)
= 0 + 0 - 55
= - 55
(53 - 45 - 49) - (53 + 45 - 49)
= 53 - 45 - 49 - 53 - 45 + 49
= (53 - 53) + (-49 + 49) - (45 + 45)
= 0 + 0 - 90
= - 90
13 - 15 + 49 - 13 + 15 - 48
= (13 - 13) + (-15 + 15) + (49 - 48)
= 0 + 0 + 1
= 1
\(1\dfrac{13}{15}\cdot0,75\cdot\left(\dfrac{8}{15}+0.25\right)\cdot\dfrac{24}{47}\)
= \(\dfrac{28}{15}\cdot\dfrac{3}{4}\cdot\left(\dfrac{8}{15}+\dfrac{1}{4}\right)\cdot\dfrac{24}{47}\)
= \(\dfrac{7}{5}\cdot\dfrac{47}{60}\cdot\dfrac{24}{47}\)
\(=\dfrac{329}{300}\cdot\dfrac{24}{47}\)
\(=\dfrac{14}{25}\)
-29.(85-47)-85.(47-29)
=-29.38-85.18
=-1102-1503
=-2605
-15.(23-29)+23-(15-29)
=-15.(-6)+23-(-14)
=90+23+14
=113+14
=127
-13.(55-29)+23.(15-29)
=-13.26+23.(-14)
=-338+(-322)
=-660
-10.(2+4)-5.(4-3)
=-10.6-5.1
=-60-5
=-65
a. 1000 - 121 -79.
= 800.
b. ( - 400 ) - (13 - 47 ).
= - 400 - 13 + 47.
= - 366.
c. ( - 215 ) + 63 + 37.
= - 215 + 100.
= - 115.
d. ( - 147 ) - ( 13 - 47 ).
= - 147 - 13 + 47.
= - 113.
e. 1945 + {( - 1945 ) - 17)}.
= 1945 - 1945 - 17.
= - 17.
f. ( - 2020 ) - {( - 2020 ) - 11 }.
= - 2020 + 2020 + 11.
= 11.
g. ( - 44 ) + {( -14 ) - 30}.
= - 44 - 14 - 30.
= - 88.
h. ( 45 - 3756 ) + 3756.
= 45 - 3756 + 3756.
= 45.
a: \(\dfrac{12}{49}< \dfrac{13}{49}< \dfrac{13}{47}\)
b: \(\dfrac{12}{47}>\dfrac{19}{47}>\dfrac{19}{77}\)
\(1\dfrac{13}{15}.0,75-\left(\dfrac{8}{15}+25\%\right).\dfrac{24}{47}-3\dfrac{12}{13}:3\)
\(=\dfrac{28}{15}.\dfrac{3}{4}-\left(\dfrac{8}{15}+\dfrac{1}{4}\right).\dfrac{24}{47}-\dfrac{51}{13}:3\)
\(=\dfrac{7}{5}-\dfrac{47}{60}.\dfrac{24}{47}-\dfrac{17}{13}\)
\(=\dfrac{7}{5}-\dfrac{2}{5}-\dfrac{17}{13}\)
\(=1-\dfrac{17}{13}=-\dfrac{4}{13}\)
13/47 . 1/8 + 13/2 . 1/47 +13/47 . -13/8 -34/47=13/47 . 1/8 + 13/47 . 1/2 + 13/47 . -13/8 -34/47=13/47 . [1/8 + 1/2 +(-13/8)] -34/47=13/47 .[1/8 + 4/8 + (-13/8)] -34/47=13/47.(-8/8) -34/47= -13/47 - 34/47=(-13/47)+(-34/47)=-47/47=-1 xong
cho 13/2 . 1/47 =13/47 . 1/2 la dung nha vi phep nhan phan so duoc doi mau so nha