a) 324 + [112- (112 + 324 ) - 230]
b) 53 . ( -15 ) + ( - 15 ) . 47
c) 43 . ( 53 - 81 ) + 53. ( 81 - 43 )
d) (192 - 37 + 85) - ( 85 + 192 )
Giải hộ mik vs ạ
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) 324-(112+324) = 324-112-324 = 0 -112 = (-112)
b) 53.(-15) + (-15)*47 = (-15)*(53+47) = (-15)*100 = -1500
c)43*(53-6) + 53*(-43) = 43*53 - 43*6 + 43*(-53)= 43*(53-53) - 43*6 = 0 - 258 = (-258)
d)(192 - 37 +85) - (85+192) = 192 -37 +85 -85 -192 = 0 -0 -37 = (-37)
10h18p ngày 1/5/2020
a) \(\dfrac{43}{47}=\dfrac{47-4}{47}=\dfrac{47}{47}-\dfrac{4}{47}=1-\dfrac{4}{47}\)
\(\dfrac{53}{57}=\dfrac{57-4}{57}=\dfrac{57}{57}-\dfrac{4}{57}=1-\dfrac{4}{57}\)
Vì \(\dfrac{4}{47}>\dfrac{4}{57}\)=>\(1-\dfrac{4}{47}< 1-\dfrac{4}{57}\)
=>\(\dfrac{43}{47}< \dfrac{53}{57}\)
b) Ta chọn phân số trung gian là: \(\dfrac{64}{81}\)
Vì \(\dfrac{64}{81}>\dfrac{64}{85}\)
Mà \(\dfrac{64}{81}< \dfrac{73}{81}\)
=> \(\dfrac{64}{85}< \dfrac{64}{81}< \dfrac{73}{81}\)
Vậy \(\dfrac{64}{85}< \dfrac{73}{81}\)
c) Ta chọn phân số trung gian là: \(\dfrac{18}{37}\)
Vì \(\dfrac{18}{37}>\dfrac{15}{37}\)
Mà \(\dfrac{18}{37}< \dfrac{18}{31}\)
=> \(\dfrac{15}{37}< \dfrac{18}{37}< \dfrac{18}{31}\)
Vậy \(\dfrac{18}{31}>\dfrac{15}{37}\)
\(\text{a) 43 (53 - 81) + 53 (81 - 43) }\)
\(=43.53-43.81+53.81-53.43\)
\(=53.\left(43-43\right)+81.\left(-43+53\right)\)
\(=53.0+81.10\)
\(=810\)
\(\text{ b) 4. (-5)2 + 2.(-5) - 20}\)
\(=\left(-20\right).2+2.\left(-5\right)-20\)
\(=2.\left[\left(-20\right)+\left(-5\right)\right]-20\)
\(=2.\left(-25\right)-20\)
\(=-50-20\)
\(=-70\)
\(\text{c) 27. (15 - 12) - 15. (27 - 12) }\)
\(=27.15-27.12-15.27+15.12\)
\(=15.\left(27-27\right)+12.\left(-17+15\right)\)
\(=15.0+12.\left(-2\right)\)
\(=-24\)
\(\text{ d) 53 + (-51) + (-53) + 49}\)
\(=53-51-53+49\)
\(=\left(53-53\right)+\left(-51+49\right)\)
\(=0+\left(-2\right)\)
\(=-2\)
chúc bạn học tốt
a, 53.(-15)+(-15).47
=(-15)(53+47)
=(-15).100
=-1500
b, 43.(53-81)+53.(81-43)
=43.(-28)+53.38
=810
c,(-5).8+53.(81-43)
=-45+53.38
=1969
d, ban tu giai nốt
a,-15 . (53+47)
= -15 . 100
=-1500
b,43.53-43.81+53.81-43.53
=(43.53-43.53)+81.(-43+53)
= 0 + 81.10
=0+810
=810
c,-40+-8
=-48
d,3.16+(-10)-20
=48+(-10)-20
=38-20
=18
a) \(\dfrac{25}{37}\times\dfrac{18}{29}+\dfrac{18}{29}\times\dfrac{12}{37}\)
\(=\dfrac{18}{29}\times\left(\dfrac{25}{37}+\dfrac{12}{37}\right)\)
\(=\dfrac{18}{29}\times\dfrac{37}{37}\)
\(=\dfrac{18}{29}\times1\)
\(=\dfrac{18}{29}\)
b) \(\dfrac{31}{85}\times\dfrac{11}{19}+\dfrac{31}{85}\times\dfrac{12}{19}-\dfrac{42}{19}\times\dfrac{31}{85}\)
\(=\dfrac{31}{85}\times\left(\dfrac{11}{19}+\dfrac{12}{19}-\dfrac{42}{19}\right)\)
\(=\dfrac{31}{85}\times\dfrac{-19}{19}\)
\(=\dfrac{31}{85}\times-1\)
\(=-\dfrac{31}{85}\)
c) \(\dfrac{16}{53}:\dfrac{17}{9}-\dfrac{16}{53}:\dfrac{17}{8}\)
\(=\dfrac{16}{53}:\left(\dfrac{9}{17}-\dfrac{8}{17}\right)\)
\(=\dfrac{16}{53}:\dfrac{1}{17}\)
\(=\dfrac{16}{901}\)
c) \(\dfrac{1}{5}\times\dfrac{12}{31}\times\dfrac{4}{3}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\dfrac{12}{31}+\dfrac{19}{31}\times\dfrac{4}{15}\)
\(=\dfrac{4}{15}\times\left(\dfrac{12}{31}+\dfrac{19}{31}\right)\)
\(=\dfrac{4}{15}\times\dfrac{31}{31}\)
\(=\dfrac{4}{15}\times1\)
\(=\dfrac{4}{15}\)
a: =18/29*(25/37+12/37)
=18/29
b: =31/85(11/19+12/19-42/19)
=-31/85
c; =16/53(9/17+8/17)=16/53
d: =4/15(12/31+19/31)=4/15
a, (-72).(15 - 49) + 15.(-56 + 72)
= -72 . 15 + 72.49 - 15.56 + 15.72
= (-72.15 + 15.72) + (72.49 - 15.56)
= 3528 - 84
= 2688
1b, 1532 + (-186) + (-1432) + (-14) + 123
= (1532 - 1432) - (186 + 14) + 123
= 100 - 200 + 123
= 223 - 200
= 23
\(43\left(53-81\right)+53\left(81-43\right)\)
\(=43.53-81+53.81-43\)
\(=81\left(53-43\right)\)
\(=81.10\)
\(=810\)
\(43\left(53-81\right)+53\left(81-43\right)\)
\(=43.53-43.81+53.81-53.43\)
\(=\left(43.53-53.43\right)+81\left(-43+53\right)\)
\(=0+81.10\)
\(=810\)
tính thường hay tính nhanh vậy bạn?
Nguyễn Hoàng Thiên Di
tính thường cx đc mà tính nhanh càng tốt nha