tinh nhanh 11+1+17+20+23+....+68
23/29+5/11+17/22
tinh nhanh
Dùng tính chất để tính
a) 17/5 . -31/125 . 1/2 . 10/17 . -1/23
b) (11/4 . -5/9 - 4/9 . 11/4) . 8/33
c) (17/28 + 18/29 - 19/30 - 20/31) . (-5/12 + 1/4 + 1/6)
d) -1/4 . 15^2/11 + 68/4 . -1/11
e) -9/25 . 53/3 - (-3/5)^2 .22/3
tinh nhanh
3) (187 -23) – (20 – 180)
4) (-37 – 17). (-9) + 35. (-9 – 11)
5) (-50 +19 +143) – (-79 + 25 + 48)
6) (-8).25.(-2). 4. (-5).125
7) 3784 + 23 – 3785 – 15
7: =-1+8=7
6: \(=-\left(8\cdot125\right)\cdot\left(2\cdot5\right)\cdot\left(25\cdot4\right)=-1000000\)
5: =-50+19+143+79-25-48
=-75+98+95
=23+95
=118
4: =37x9+17x9-35x9-35x11
=18+153-385
=-214
tinh nhanh
3) (187 -23) – (20 – 180)
4) (-37 – 17). (-9) + 35. (-9 – 11)
5) (-50 +19 +143) – (-79 + 25 + 48)
6) (-8).25.(-2). 4. (-5).125
7) 3784 + 23 – 3785 – 15
3: =187-23-20+180
=367-43
=324
4: \(=37\cdot9+17\cdot9-35\cdot9-35\cdot11=19\cdot9-385\)
\(=171-385=-214\)
5: =-50+19+143+79-25-48
=-75+94+95
=20+94
=114
3 ; 324
4 ; -214
5 ; 118
6 ; - 1 000 000
7 ; 7
học tốt
dat tinh roi tinh
68*35
17*86
175*42
62*49
53*29
1023*29
2075*23
ai nhanh minh tick cho
ket ban nha
68*35=2380
17*86=1462
175*42=7350
62*49=3038
53*29=1537
1023*29=29667
2075*23=47725
Tính nhanh
a) 23 - 21 + 19 - 17 + 15 - 13 + 11 - 9 + 7 - 5 + 3 - 1;
b) 24 - 22 + 20 - 18 + 16 - 14 + 12 - 10 + 8 - 6 + 4 - 2
a. ( 23 - 21) + ( 19 - 17) + ( 15 - 13) + ( 11 - 9) + ( 7 - 5) + ( 3 - 1)
= 2 + 2 + 2 + 2 + 2 + 2
= 2 x 6
= 12
b. ( 24 - 22 ) + ( 20 - 18 ) + ( 16 - 14 ) + ( 12 - 10) + ( 8 - 6 ) + ( 4 - 2)
= 2 + 2 + 2 + 2 + 2 + 2
= 2 x 6
= 12
Quy đồng mẫu số cá phân số sau
a)2\19 và 3\17
b)12\15 và 11\17
c)2007\2008 và 2009\2010
d)25\28 và 20\35
e)17\68 và 1\5
ai nhanh mình tick cho
\(a)34/323; 57/323 b)204/255; 165/255 c)4034070/4036080; 4034072/4036080 d)875/980; 560/980 e)85/340; 68/340\)
a: 2/19=34/323
3/17=57/323
b: 12/15=204/255
11/17=165/255
c: 2007/2008=4034070/4036080
2009/2010=4034072/4036080
d: 25/28=125/140
20/35=80/140
e: 17/60=1/4=5/20
1/5=4/20
a ) 34 / 323 ; 57 / 323
b ) 204 / 255 ; 165 / 255
c ) 4034070 / 4036080 ; 4034072 / 4036080
d ) 875 / 980 ; 560 / 980
e ) 85 / 340 ; 68 / 340
đây nha
-(23/55+17/20)+(7/20-2/11)-1/-2
\(-\left(\dfrac{23}{55}+\dfrac{17}{20}\right)+\left(\dfrac{7}{20}-\dfrac{2}{11}\right)-\dfrac{1}{-2}\\ =\dfrac{-279}{220}+\dfrac{37}{220}+\dfrac{1}{2}\\ =\dfrac{-11}{10}+\dfrac{1}{2}\\ =\dfrac{-3}{5}\)
Tính
a) -19 - |+13| + |-10| - (-5) - 11
b) ( -10) - (11) + |-5| - |-7| - 8
c) - (-8) - (+7) - |-11| + |+12|
d) -14 - |-18| - (-20) - |-25|
đ) 23 - |-15| - (-17) + |-13|
Nhanh lên voeí ạ !
a) Ta có: \(-19-\left|+13\right|+\left|-10\right|-\left(-5\right)-11\)
\(=-19-13+10+5-11\)
\(=-28\)
b) Ta có: \(\left(-10\right)-\left(11\right)+\left|-5\right|-\left|-7\right|-8\)
\(=-10-11+5-7-8\)
\(=-31\)
c) Ta có: \(-\left(-8\right)-\left(+7\right)-\left|-11\right|+\left|+12\right|\)
\(=8-7-11+12\)
\(=2\)
d) Ta có: \(-14-\left|-18\right|-\left(-20\right)-\left|-25\right|\)
\(=-14-18+20-25\)
\(=-37\)
đ) Ta có: \(23-\left|-15\right|-\left(-17\right)+\left|-13\right|\)
\(=23-15+17+13\)
\(=38\)