thuc hien phep tinh:
a, -3+(-13)
b, (-51).12+12.(-49)
c, 317-12+8+(-217)
d, 25.(27-39)-27.(25-39)
Thuc hien phep tinh
A, 3/7 + 1/2 - (-3)/70
B, 3/5 + -1/25 - 35/100
C, 5/12 - 3/-16 + 3/4
D, 5/15 + 4/-12 + 1/7 - 1/-6
a,3/7 +1/2-[-3]/70
=13/14 -[-3]/70
=65/70 -[-3]/70
=34/35
b,3/5+-1/25 -35/100
=14/25 - 35/100
=56 /100 -35/100
= 21/100
c ,5/12 -3/-16+3/4
=29/48 +3/4
= 29/48 +36/48
=65/48
d, 5/15 +4/-12 +1/7 -1/-6
= 1/3 +1/-3 +1/7-1/-6
=0+1/7-1/-6
= 13/42
A.\(\dfrac{3}{7}+\dfrac{1}{2}+\dfrac{\left(-3\right)}{70}\)
=\([\dfrac{30}{70}+\dfrac{\left(-3\right)}{70}]\)+\(\dfrac{1}{2}\)
= \(\dfrac{27}{70}+\dfrac{35}{70}\)
=\(\dfrac{62}{70}=\dfrac{31}{35}\)
B.\(\dfrac{3}{5}+\dfrac{-1}{25}-\dfrac{35}{100}\)
=\(\dfrac{60}{100}+\dfrac{-4}{100}-\dfrac{35}{100}\)
=\(\dfrac{60+\left(-4\right)-35}{100}\)
=\(\dfrac{21}{100}\)
C.\(\dfrac{5}{12}-\dfrac{3}{-16}+\dfrac{3}{4}\)
=\(\left(\dfrac{5}{12}+\dfrac{9}{12}\right)-\dfrac{-3}{16}\)
=\(\dfrac{7}{6}-\dfrac{-3}{16}\)
=\(\dfrac{56}{48}-\dfrac{-9}{48}\)=\(\dfrac{65}{48}\)
D.\(\dfrac{5}{15}+\dfrac{4}{-12}+\dfrac{1}{7}-\dfrac{1}{-6}\)
=\(\dfrac{1}{3}+\dfrac{1}{7}+(\dfrac{-2}{6}-\dfrac{-1}{6})\)
=\(\dfrac{1}{3}+\dfrac{1}{7}+\dfrac{-1}{6}\)
=\((\dfrac{1}{3}+\dfrac{-1}{6})+\dfrac{1}{7}\)
=\(\dfrac{1}{6}+\dfrac{1}{7}\)=\(\dfrac{13}{42}\)
Thuc hien phep tinh
a) ( -5 ) + ( -9 ) + ( -12)
b) ( -8 ) + ( - 13 ) + ( -54 ) + ( -67 )
c) 12 + 38 - 30 - 22
d) 34 + ( -43 ) + 66 - 57
a)-26
b)-142
c)-2
d)0
a) Ta có: (-5)+(-9)+(-12)
=-(5+9+12)
=-26
b) Ta có: (-8)+(-13)+(-54)+(-67)
=(-8-54)+(-13-67)
=-62-80
=-142
c) Ta có: 12+38-30-22
=(12-22)+(38-30)
=-10+8
=-2
d) Ta có: 34+(-43)+66-57
=(34+66)-(43+57)
=100-100
=0
a,[ - 5 ] + [ - 9 ] + [ - 12 ]
= -[ 5 + 9 + 12 ]
= - 26
b, [ - 8] + [-13] + [-54] + [-67]
= [-8] + [-13] + [-52+2] + [-67]
= - { [ 8 + 54] + [13+67]}
= - { 62 + 80 }
= - 142
c, 12 + 38 - 30 - 22
= [12+38]-[30+22]
= 50 - 52
= - 2
d, 34 + [-43]+66-57
= 34 - 43 + 66 - 57
= [ 34 + 66 ] - [ 43 + 57 ]
= 100 - 100
= 0
chúc bạn học tốt
Bai 1 Tim x biet
a)162+(15-x0=125
b)x^3*x^2=2^7/4
c)5(x+27)=200
d)x-3=6-(19-23)
e)(x+32)-145=92
f) 2*3^x=162
g)9x-9=3^2/3
h)162-(15+x)=148
Bai 2 Thuc hien phep tinh
a)12+14+16+18+...+86+88
b)217+[43+(-217)+(-23)]
c) (-345)+[(-724)+345+224]
d)2^3*3-(12-36)
mình giải ý c
5(x+27)=200
(x+27)=200:5
(x+27)=40
x=40-27
x=13
thuc hien phep tinh:
a, -23+13-(-7)
b, 3.(-4)²:(-12)+[-45-(-34+31)³]
c, |-40|:8+4.(-2)-|+7|
a)-23+13-(-7)=-23+13+7=-23+(13+7)=-23+20=-(23-20)=-3
b)3.(-4)^2:(-12)+[-45-(-34+31)^3]=3.16:(-12)+[-45-(-3)^3]=48:(-12)+[-45+27]=-4+(-18)=-22
c)l-40l:8+4.(-2)-l+7l=40:8-8-7=5-8-7=-73-7=-10
1..tinh nhanh
22-(-23)-23.78
b) -83.36+17.(-36)
c) 30.(18-39)-39.(30-18)
2...thuc hien phep tinh
a) [18-(-21)+(-9)]-13
b)125-139+200-(-75)
c) (-33)-(-12)-4
d) 22+(-31)-32+50
giup mk xiu nha mk tick cho
..tinh nhanh
22-(-23)-23.78
b) -83.36+17.(-36)
c) 30.(18-39)-39.(30-18)
2...thuc hien phep tinh
a) [18-(-21)+(-9)]-13
b)125-139+200-(-75)
c) (-33)-(-12)-4
d) 22+(-31)-32+50
giup mk xiu nha mk k cho
Toán
ai tích mình tích ali
thuch hien cac phep tinh sau
a)-3/8:-9/16-7/6
b)75%-7/4+1,25 .2/5
c) 1,4 .15/49-( 4/5-2/3):11/5
d)(-1/2)-(15,4-39/5).25%
Thuc hien phep tinh sau bang cach hop li nhat:
a)5/11+1/2+2/5+6/11+3/4+16/25+5/16
b)19/4+37/100+1/8+132/25+5/2+37/12
5/11+1/2+2/5+6/11+3/4+16/25+5/16
=1441/400
19/4+37/100+1/8+132/25+5/2+37/12
=1933/120
Ban lam sao duooc nhu the giai ra cho minh voi
Bai 1
Thuc hien phep tinh
a,(135-35) .(-47)+53 .(-48-52)
b,25 .(75-49)+75 .|25-49|
Bai 2
Tim x\(\varepsilon\)Z biet
a,(-x+31)-39=-69+11
b,x-{57-[42+(-23-x)]}=13-{47+[25-(32-x)]}
c,|2-x|+2=x
Giup minh voi
Tập ghi có dấu đi bạn ei
ghi như thế méo ai hiểu đâu
và......kết bạn nha!
>< :3 :))
a. ( 135 - 35 ) ( -47 ) + 53 ( -48 - 52 )
= 100 ( -47 ) + 53 ( -100 )
= -4700 + -5300
= -10000
b. 25 ( 75 - 49 ) + 75 | 25 - 49 |
= 25 . 26 + 75 | -24 |
= 650 + 75 . 24
= 650 + 1800
=2450
Bài 1: Tính một cách hợp lí:
1) 2155 - ( 174 + 2155 ) + ( -68 + 174 ) 7) -1911 - ( 1234 - 1911 )
2) -25 . 72 + 25 . 21 - 49 . 25 8) 156 . 72 + 28 . 156
3) 35 . ( 14 - 23 ) - 23 . ( 14 - 35 ) 9) 32. ( -39 ) + 16 . ( -22 )
4) 8154 - ( 674 + 8154 ) + ( -98 + 674 ) 10) -1945 - ( 567 - 1945 )
5) -25 . 21 + 25 . 72 + 49 . 25 11) 184 . 33 + 67 . 184
6) 27 . ( 13 - 16 ) - 16 . ( 13 - 27) 12) 44 . ( -36 ) + 22 . ( -28 )
1) 2155-(174+2155)+(-68+174-7)-1911-(1234-1911)
=2155-174-2155+(-68)+174-7-1911-1234+1911
=(2155-2155)+(174-174)+(1911-1911)-(68+7+1234)
= 0 + 0 + 0 - 1309
= -1309