Tính:
a) (-30) + (-5)
b) (-7 ) + (-13)
c) (-15) + (-235)
Những câu hỏi liên quan
tính
a] (-30)+(-13)
B] (-7)+(13)
C(-15)+(-235)
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Tính : a, ( - 30 ) + ( - 5 ) ; b, ( - 7 ) + ( - 13 ) ; c, ( - 15) + ( -235 ).
a, -35
b, -20
c, -250
k nha ok @@@@@@@@@@@@@
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1.Tính
a) ( - 30 ) + ( - 5 )
b) ( - 7 ) + ( - 13 )
c) ( -15 ) + ( 235)
d) 16 + ( - 6 )
e) 14 + ( - 6 )
f) ( - 8 ) + 12
1.Tính
a) ( - 30 ) + ( - 5 ) =-35
b) ( - 7 ) + ( - 13 ) =-20
c) ( -15 ) + ( 235)=220
d) 16 + ( - 6 ) =10
e) 14 + ( - 6 ) =8
f) ( - 8 ) + 12 =4
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Tính :
a) \(\left(-30\right)+\left(-5\right)\)
b) \(\left(-7\right)+\left(-13\right)\)
c) \(\left(-15\right)+\left(-235\right)\)
a) (−30)+(−5)= - (30+5)= -35
b) (−7)+(−13)= -(7+13)= -20
c) (−15)+(−235)= -(15+235)= -250
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a) (-30) + (-5)
= -35
b) (-7) + (-13)
= -20
c) (-15) + (-235)
= -250
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Bài 1 : Thực hiện phép tính sauuu
a) -17/30 - 11/-15 + -7/12
b) -5/9 + 5/9 : ( 5/3 - 25/12)
c) -7/25 . 11/13 + -7/25 . 2/13 - 18/25
`Answer:`
a. \(-\frac{17}{30}-\frac{11}{-15}+-\frac{7}{12}\)
\(=-\frac{17}{30}+\frac{11}{15}-\frac{7}{12}\)
\(=-\frac{17}{30}+\frac{22}{30}-\frac{7}{12}\)
\(=\frac{1}{6}-\frac{7}{12}\)
\(=-\frac{5}{12}\)
b. \(-\frac{5}{9}+\frac{5}{9}:\left(\frac{5}{3}-\frac{25}{12}\right)\)
\(=-\frac{5}{9}+\frac{5}{9}:\left(-\frac{5}{12}\right)\)
\(=\frac{5}{9}.\left(-1\right)+\frac{5}{9}.\left(-\frac{12}{5}\right)\)
\(=\frac{5}{9}.\left(-1-\frac{12}{5}\right)\)
\(=\frac{5}{9}.\frac{-17}{5}\)
\(=-\frac{17}{9}\)
c. \(-\frac{7}{25}.\frac{11}{13}+-\frac{7}{25}-\frac{2}{13}-\frac{18}{25}\)
\(=\frac{77}{325}-\left(\frac{7}{25}+\frac{18}{25}\right)-\frac{2}{13}\)
\(=\frac{77}{325}-1-\frac{2}{13}\)
\(=-\frac{452}{325}\)
Điền dấu >,<,=
a,13/15+19/20+17/23...3
b,7/5+4/4+9/8+3/2...4
Không tính kết quả cụ thể
c,8/7+11/13+23/30+39/45...4
a,13/24+5/12=
b,4/7-3/8=
c,19/17+13/51
d,26/30-7/15
Tính
a.13/7-1/2x13/7+3/2x13/7
b.1/15x(3/7+5/19)+3/7x(5/19-1/15)
c.5/6+5/12+5/20+5/30+...+5/9900
a) \(\frac{13}{7}-\frac{1}{2}\times\frac{13}{7}+\frac{3}{2}\times\frac{13}{7}\)
\(=\frac{13}{7}\times\left(1-\frac{1}{2}+\frac{3}{2}\right)\)
\(=\frac{13}{7}\times2\)
\(=\frac{26}{7}\)
b) \(\frac{1}{15}\times\left(\frac{3}{7}+\frac{5}{19}\right)+\frac{3}{7}\times\left(\frac{5}{19}-\frac{1}{15}\right)\)
\(=\frac{1}{15}\times\frac{3}{7}+\frac{1}{15}\times\frac{5}{19}+\frac{3}{7}\times\frac{5}{19}-\frac{3}{7}\times\frac{1}{15}\)
\(=\frac{5}{19}\times\left(\frac{1}{15}+\frac{3}{7}\right)\)
\(=\frac{5}{19}\times\frac{52}{105}\)
\(=\frac{52}{399}\)
c) \(\frac{5}{6}+\frac{5}{12}+\frac{5}{20}+\frac{5}{30}+...+\frac{5}{9900}\)
\(=5\times\left(\frac{1}{2\times3}+\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}+...+\frac{1}{99\times100}\right)\)
\(=5\times\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{99}-\frac{1}{100}\right)\)
\(=5\times\left(\frac{1}{2}-\frac{1}{100}\right)\)
\(=5\times\frac{49}{100}\)
\(=\frac{49}{20}\)
Lần sau nên đăng ít thôi
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1, Thực hiện phép tính ( tính hợp lý nếu có thể) A, -1/12+4/3 B,(-4/14-3/15)-(1/5-20/35- -1)7 C, 3/5+ -5/20+30/75+ -7/4 D, 5/6. -12/13 + 7/13 E, 2/-9 - 5/-36 - 1/4 F, 2/23 +-5/12+7/18+21/23+ -7/12
c) Ta có: \(\dfrac{3}{5}+\dfrac{-5}{20}+\dfrac{30}{75}+\dfrac{-7}{4}\)
\(=\dfrac{3}{5}+\dfrac{2}{5}+\dfrac{-1}{4}+\dfrac{-7}{4}\)
\(=1-2=-1\)
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Giải:
a)-1/12+4/3=-1/12+16/12=15/12=5/4
b)(-4/14-3/15)-(1/5-20/35-(-1)).7
=-17/35-22/35.7
=-17/35-22/5
=-171/35
c)3/5+-5/20+30/75+-7/4
=3/5+-1/4+2/5+-7/4
=(3/5+2/5)+(-1/4+-7/4)
=1+-2
=-1
d)5/6.-12/14+7/13
=-5/7+7/13
=-16/91
e)2/-9-5/-36-1/4
=-1/12-1/4
=-1/3
f)2/23+-5/12+7/18+21/23+-7/12
=(2/23+21/23)+(-5/12+-7/12)+7/18
=1+-1+7/18
=7/18
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