3/7.6/29-3/7.35/29+2023 3/7
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- Tính giá trị biểu thức:
a) (2/5 x 25/29) + (3/5 x 25/29)
= (50/145) + (75/145)
= 125/145
b) (5/2 x 3/7) - (3/14 : 6/7)
= 15/14 - (3/14 x 7/6)
= 15/14 - 1/2
= (30/28) - (14/28)
= 16/28
= 4/7
c) (15/4 : 5/12) - (6/5 : 11/15)
= (15/4 x 12/5) - (6/5 x 15/11)
= 180/20 - 90/55
= 9 - 18/11
= (99/11) - (18/11)
= 81/11
= 7 4/11
- Tính giá trị biểu thức:
a) (2/3) + (20/21 x 3/2 x 7/5)
= 2/3 + (60/210)
= 2/3 + 2/7
= (14/21) + (6/21)
= 20/21
b) (5/17 x 21/32 x 47/24 x 0)
= 0
c) (11/3 x 26/7) - (26/7 x 8/3)
= (286/21) - (208/21)
= 78/21
= 3 9/21
= 3 3/7
- Tìm x:
a) (25/8) : x = 5/16
=> (25/8) x (16/5) = x
=> 4 = x
b) x + (7/15) = 6/15
=> x = (6/15) - (7/15)
=> x = -1/15
c) x : (28/49) = 7/12
=> x x (49/28) = 7/12
=> x = (7/12) x (28/49)
=> x = 1/2
- Tìm x:
a) 6 x x = (5/8) : (3/4)
=> 6x = (5/8) x (4/3)
=> 6x = 20/24
=> 6x = 5/6
=> x = (5/6) / 6
=> x = 5/36
câu,b,không,đủ,thông,tin,nhan,bạn.
\(\frac{-15}{29}.\frac{7}{8}-\frac{15}{29}.\frac{3}{8}+\frac{15}{29}:\frac{4}{3}\)
\(=\left(\frac{-15}{29}\right)\left(\frac{7}{8}+\frac{3}{8}-\frac{6}{8}\right)\)
\(\left(\frac{-15}{29}\right).\frac{1}{2}=\frac{-15}{58}\)
-15/29 . 7/8 - 15/29 . 3/8 + 15/29 : 4/3 = 15/29 . -7/8 - 15/29 . 3/8 + 15/29 . 3/4
=15/29 . ( -7/8 - 3/8 + 3/4)
=15/29. -1/2
=-15/58
a)(−2023).33+2023.(−68)+2023�)(-2023).33+2023.(-68)+2023
=2023.(−33−68+1)=2023.(-33-68+1)
=2023.(−100)=2023.(-100)
=−202300=-202300
b)(38−29+43)−(43+38)�)(38-29+43)-(43+38)
=38−29+43−43−38=38-29+43-43-38
=(38−38)−29+(43−43)=(38-38)-29+(43-43)
=−29=-29
=−29=-29
a) \(\left(\dfrac{3}{29}-\dfrac{1}{5}\right)\cdot\dfrac{29}{3}\)
\(=\dfrac{3}{29}\cdot\dfrac{29}{3}-\dfrac{1}{5}\cdot\dfrac{29}{3}\)
\(=1-\dfrac{29}{15}\)
\(=\dfrac{15-29}{15}\)
\(=-\dfrac{14}{15}\)
b) \(\dfrac{3}{4}\cdot\dfrac{7}{9}+\dfrac{1}{4}\cdot\dfrac{7}{9}\)
\(=\dfrac{7}{9}\cdot\left(\dfrac{1}{4}+\dfrac{3}{4}\right)\)
\(=\dfrac{7}{9}\cdot1\)
\(=\dfrac{7}{9}\)
c) \(\dfrac{1}{7}\cdot\dfrac{5}{9}+\dfrac{5}{9}\cdot\dfrac{1}{7}+\dfrac{5}{9}\cdot\dfrac{3}{7}\)
\(=\dfrac{5}{9}\cdot\left(\dfrac{1}{7}+\dfrac{1}{7}+\dfrac{3}{7}\right)\)
\(=\dfrac{5}{9}\cdot\dfrac{5}{7}\)
\(=\dfrac{25}{63}\)
d) \(4\cdot11\cdot\dfrac{3}{4}\cdot\dfrac{9}{121}\)
\(=\left(4\cdot\dfrac{3}{4}\right)\cdot\left(11\cdot\dfrac{9}{121}\right)\)
\(=3\cdot\dfrac{9}{11}\)
\(=\dfrac{27}{11}\)
\(=4+\dfrac{5}{58}-3-\dfrac{1}{2}+8+\dfrac{15}{29}-3-\dfrac{5}{58}+7+\dfrac{14}{29}=13+\dfrac{1}{2}=\dfrac{27}{2}\)
b: \(=\dfrac{2}{7}-\dfrac{3}{7}\cdot\dfrac{-2}{3}=\dfrac{2}{7}+\dfrac{2}{7}=\dfrac{4}{7}\)
c: \(=\dfrac{3}{7}-\dfrac{7}{2}-\dfrac{3}{7}+\dfrac{7}{2}=0\)
a) (-370) + 114 + 236 + 370
= (-370 + 370) + 114 + 236
= 114 + 236
= 350
b, (-120) + (-130) + 360 + (-110)
= (-120 - 130 - 110) + 360
= -360 + 360
= 0
c, 25 + 37 - 48 - 25 - 37
= (25 - 25) + (37 - 37) - 48
= -48
d, (-125) - (19 - 125)
= -125 - 19 + 125
= (-125 + 125) - 19
= -19
e, 100 - [ 25 - (-19 - 11)]
= 100 - (25 + 19 + 11)
= 100 - (25 + 30)
= 100 - 55
= 45
f, 271 - [( -43) + 271 - (-17)]
= 271 - (-43 + 271 + 17)
= 271 + 43 - 271 + 17
= (271 - 271) + (43 + 17)
= 60
g, 35 . (-29) + (-29) . 65
= (-29)(35 + 65)
= (-29) . 100
= -2900
h, 22 . (-8) . (-25) . 125 . 18
= 4 . (-8) . (-25) . 125 . 18
= [4 . (-25)] . [(-8) . 125] . 18
= -100 . (-1000) . 18
= 100000 . 18
= 1800000
i, 48 : (-6 . 4 + 8)
= 48 : (-24 + 8)
= 48 : (-16)
= -3
j, -3 . 7 - 4 . (-5) + 1
= -21 + 20 + 1
= 0
k, 16 + (102 -7.6) - ( 94 . 17 - 27 . 94)
= 16 + (102 - 42) - 94(17 - 27)
= 16 + 102 - 42 - 94 . (-10)
= 16 + 102 - 42 + 940
= 16 + 60 + 940
= 16 + (60 + 940)
= 16 + 1000
= 1016
Chúc bn học tốt (Đây là cách của mình, mình nghĩ còn nhiều cách nữa, bạn có thể tham khảo bài mình)
-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: =(5/7+2/7)+(4/3+5/3)=3+1=4
b: =(17/12+7/12)+(29/7-8/7)
=2+3=5
c: =(2/5+3/5)+(6/9+1/3)+(7/4+1/4)
=1+2+1
=4
d: =(1/3+2/3)+(13/17+4/17)+(29/11+4/11)
=1+1+3=5
3/7 . 6/29 - 3/7 . 35/29 + 2023 . 3/7
= 3/7 . (6/29 - 35/29 + 2023)
= 3/7 . (-1 + 2023)
= 3/7 . 2022
= 6066/7