9/5:17/15+8/5:17/15
9/5 : 17/15 + 8/5 : 17/15=..............
=...............
= 17/15 : ( 9/5 + 8,5 )
= 17/15 :17/5
= 1/3
\(\dfrac{9}{5}:\dfrac{17}{15}+\dfrac{8}{5}:\dfrac{17}{15}=\dfrac{9}{5}\times\dfrac{15}{17}+\dfrac{8}{5}\times\dfrac{15}{17}=\dfrac{15}{17}\times\left(\dfrac{9}{5}+\dfrac{8}{5}\right)=\dfrac{15}{17}\times\dfrac{17}{5}=\dfrac{255}{85}=3\)
9/5 : 17/15 + 8/5 : 17/15= 17/15 : ( 9/5 + 8,5 )
= 17/15 : 17/5
= 1/3
9/5:17/15+8/5:17/15
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{17}{15}:\left(\frac{9+8}{5}\right)\)
\(=\frac{17}{15}:\frac{17}{5}\)
\(=\frac{17}{15}X\frac{5}{17}\)
\(=\frac{1}{3}\)
Chúc bn học tốt
Tk cho mình nhé
Tính nhanh:9/5:17/15+8/5:17/15
9/5:17/15+8/5:17/15
=(9/5+8/5):17/15
=17/5:17/15
=3
Chúc bạn học giỏi nha!!!
K cho mik vs nhé Tuyên
9/5:17/15+8/5+17/15
=(9/5+8/5):17/15
=17/5:17/15
=3
3 Tinh bang hai cach : .
9/5 : 17/15 + 8/5 : 17/15
C1 : = ...
= ...
9/5 : 17/15 + 8/5 : 17/15
C2 : = ...
= ...
Cac bạn ơi giúp voi.
cach 1 : ban tinh nhu binh thuong
cach 2:(9/5 + 8/5 ) : 17/15 .ban tu tinh nhe
Viết số vào chỗ chấm cho thích hợp:
15−5=… 15−6=… |
15−7=… 15−8=… |
16−7=… 16−8=… |
16−9=… 18−9=… |
17−8=… 17−9=… |
|
15 – 5 = 10 15 – 6 = 9 |
15 – 7 = 8 15 – 8 = 7 |
16 – 7 = 9 16 – 8 = 8 |
16 – 9 = 7 18 – 9 = 9 |
17 – 8 = 9 17 – 9 = 8. |
|
tính nhanh
a, -5/9+8/18+-2/11+4/-9+7/15
b, 5/17+-9/15+-2/17+2/5+14/17
a,-5/9 + 8/18 + -2/11 + 4/-9 + 7/15 b,5/17 + -9/15 + -2/17 + 2/5 + 14/17
= -5/9 + 4/9 + -2/+ 4/-9 + 7/15 = 5/17 + -3/5 + -2/17 + 2/5 + 14/17
=(-5/9 + 4/9 + -4/9 ) +-2/11 + 7/15 = ( 5/17 + -2/17 + 14/17) + ( 2/5 + -3/5)
= -1/3 + -2/11 + 7/15 =1 + -1/5
=-75/225 + -30/ 225 + 77/225 =4/5
= -25/225 = -1/9 ( 4/5 = 0.8 )
tính bằng 2 cách : 9/5 :17/15 + 8/5 : 17/15
9/5:17/15+8/5:17/15
=27/17 + 24/17
=51/17=3
C1: \(\frac{9}{5}\div\frac{17}{15}+\frac{8}{5}\div\frac{17}{15}\)
\(=\frac{27}{17}+\frac{24}{17}\)
\(=3\)
C2: \(\frac{9}{5}\div\frac{17}{15}+\frac{8}{5}\div\frac{17}{15}\)
\(=\left(\frac{9}{5}+\frac{8}{5}\right)\div\frac{17}{15}\)
\(=\frac{17}{5}\div\frac{17}{15}\)
\(=3\)
C1 :9/5 :17/15 +8/5 :17/`5 C2 : ( 9/5 +8 /5 ) :17/15
=9/5*15/17 + 8/5 * 15/17 =17/5 :17/15
=9*15 /5*17 + 8* 15 / 5 *17 =3
27/17 + 24/17 =51/17 =3
mk trả lời đầu tiên đúng thì
Tính bằng hai cách : 9/5 : 17/15 + 8/5 : 17/15 = ?
C1:(9/5+8/5):17/15=17/5:17/15=3(nhớ bình chọn nha)
C2;27/17+24/17=3(nhớ bình chọn nha)
cách 1: \(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{15}{17}.\left(\frac{9}{5}+\frac{8}{5}\right)=\frac{15}{17}.\frac{17}{5}=3\)
cách 2: \(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=3.\frac{3}{17}+8.\frac{3}{17}=\frac{27}{17}+\frac{24}{17}=\frac{51}{17}=3\)
có ai học ở trường thanh xuân nam hà nội ko
Tính nhẩm:
a)
15 − 6=..... 15 − 7=.....
15 − 8=..... 15 − 9=.....
16 − 7=..... 16 − 8=.....
16 − 9=..... 17 − 8=.....
17 − 9=..... 18 − 9=.....
b)
18 − 8 − 1=..... 18 − 9=.....
15 − 5 − 2=..... 15 − 7=.....
16 − 6 − 3=..... 16 − 9=.....
Phương pháp giải:
Trừ nhẩm các số rồi điền kết quả vào chỗ trống.
Lời giải chi tiết:
a)
15 − 6 = 9 15 − 7 = 8
15 − 8 = 7 15 − 9 = 6
16 − 7 = 9 16 − 8 = 8
16 − 9 = 7 17 − 8 = 9
17 − 9 = 8 18 − 9 = 9
b)
18 − 8 − 1 = 9 18 − 9 = 9
15 − 5 − 2 = 8 15 − 7 = 8
16 − 6 − 3 = 7 16 − 9 = 7
15 - 6 = 9,
15 - 8 =7,
15 - 7 = 8,
15 - 9 = 6