rút gọn rồi tính :
a)8/18 + 5/4
b) 8/24 + 12/28
tính :
8/7+10/21
Rút gọn rồi tính:
A) 8/24 - 5/ 25
B) 18/21 - 12/27
\(a,\dfrac{8}{24}-\dfrac{5}{25}=\dfrac{1}{3}-\dfrac{1}{5}=\dfrac{5}{15}-\dfrac{3}{15}=\dfrac{2}{15}\)
\(b,\dfrac{18}{21}-\dfrac{12}{27}=\dfrac{6}{7}-\dfrac{4}{9}=\dfrac{26}{63}\)
a) \(\dfrac{8}{24}-\dfrac{5}{25}=\dfrac{8:8}{24:8}-\dfrac{5:5}{25:5}=\dfrac{1}{3}-\dfrac{1}{5}=\dfrac{5}{15}-\dfrac{3}{15}=\dfrac{2}{15}\)
b) \(\dfrac{18}{21}-\dfrac{12}{27}=\dfrac{18:3}{21:3}-\dfrac{12:3}{27:3}=\dfrac{6}{7}-\dfrac{4}{9}=\dfrac{54}{63}-\dfrac{28}{63}=\dfrac{26}{63}\)
Rút gọn rồi tính các phân số sau:
8/24 - 5/25 18/21 - 12/27
giúp mình với, trả lời mình tick cho nhé
\(\dfrac{8}{24}-\dfrac{5}{25}=\dfrac{1}{3}-\dfrac{1}{5}=\dfrac{5}{15}-\dfrac{3}{15}=\dfrac{2}{15}\\ \dfrac{18}{21}-\dfrac{12}{27}=\dfrac{6}{7}-\dfrac{4}{9}=\dfrac{54}{63}-\dfrac{28}{63}=\dfrac{26}{63}\)
1) tính
A) 7/8 - 5/12
B) 8/15 - 2/5
C) 5/6 - 3/10
D) 7/10 - 1/5
2) rút gọn rồi tính
A);5/10 - 2/15
B) 5/20 - 1/6
C) 6/18 - 6/24
D) 5 9 - 3/12
A) \(\frac{7}{8}-\frac{5}{12}=\frac{84}{96}-\frac{40}{96}=\frac{44}{96}=\frac{11}{24}\)
B)\(\frac{8}{15}-\frac{2}{5}=\frac{8}{15}-\frac{6}{15}=\frac{2}{15}\)
C)\(\frac{5}{6}-\frac{3}{10}=\frac{50}{60}-\frac{18}{60}=\frac{32}{60}=\frac{8}{15}\)
D)\(\frac{7}{10}-\frac{1}{5}=\frac{7}{10}-\frac{2}{10}=\frac{5}{10}=\frac{1}{2}\)
2)A)\(\frac{5}{10}-\frac{2}{15}=\frac{1}{2}-\frac{2}{15}=\frac{15}{30}-\frac{4}{30}=\frac{11}{30}\)
B)\(\frac{5}{20}-\frac{1}{6}=\frac{1}{4}-\frac{1}{6}=\frac{6}{24}-\frac{4}{24}=\frac{2}{24}=\frac{1}{12}\)
C)\(\frac{6}{18}-\frac{6}{24}=\frac{1}{3}-\frac{1}{4}=\frac{4}{12}-\frac{3}{12}=\frac{1}{12}\)
D)\(\frac{5}{9}-\frac{3}{12}=\frac{5}{9}-\frac{1}{4}=\frac{20}{36}-\frac{9}{36}=\frac{11}{36}\)
Chúc bạn học tốt
Rút gọn rồi tính: a)5/8+18/27 b)12/20+6/18 c)8/12+20/30 đ)10/12+12/36
b: 12/20+6/18=3/5+1/3=9/15+5/15=14/15
c: 8/12+20/30=2/3+2/3=4/3
d: 10/12+12/36=5/6+2/6=7/6
Bài 2. Rút gọn rồi tính:
a) 8/5 - 18/ 27
b) 12/20 - 6/18
c) 8/24 - 5/25
d) 18/21 - 12/27
nhanh lên làm giúp mình với 6 bạn trả lời đầu tiên sẽ được mình tick đúng
a)8/5-18/27=216/135-90/135=126/135
b)3/5-1/3=9/15-5/15=4/15(rút gọn p/s)
c)1/3-1/5=5/15-3/15=2/15
d)6/7-12/27=162/189-84/189=78/189
a) 8/5 - 18/27
= 8/5 - 2/3
= 24/15 - 10/15
= 14/15
b) 12/20 - 6/18
= 3/5 - 1/3
= 9/15 - 5/15
= 4/15
c) 8/24 - 5/25
= 1/3 - 1/5
= 5/15 - 3/15
= 2/15
d) 18/21 - 12/27
= 6/7 - 4/9
= 54/63 - 28/63
= 26/63
1.rút gọn rồi tính
8/12+16/30=
10/25+24/36=
18/27+35/42=
2.tính nhanh
3/7+6/5+4/7=
6/4+7/3+4/4+3/3=
Nay rảnh lại qua làm mấy bài lớp 4 ^^
Tui làm luôn kh ghi đề nhá
1,
\(\frac{2}{3}+\frac{8}{15}=\frac{6}{5}\)
\(\frac{2}{5}+\frac{2}{3}=\frac{16}{15}\)
\(\frac{2}{3}+\frac{5}{6}=\frac{3}{2}\)
2,
\(\cdot\frac{3}{7}+\frac{6}{5}+\frac{4}{7}\)
\(=\frac{3}{7}+\frac{4}{7}+\frac{6}{5}\)
\(=1+\frac{6}{5}\)
\(=\frac{11}{5}\)
\(\cdot\frac{6}{4}+\frac{7}{3}+\frac{4}{4}+\frac{3}{3}\)
\(=\frac{6}{4}+\frac{4}{4}+\frac{7}{3}+\frac{3}{3}\)
\(=\frac{10}{4}+\frac{10}{3}\)
\(=\frac{35}{6}\)
23+815=6523+815=65
25+23=161525+23=1615
23+56=3223+56=32
2,
⋅37+65+47⋅37+65+47
=37+47+65=37+47+65
=1+65=1+65
=115=115
⋅64+73+44+33⋅64+73+44+33
=64+44+73+33=64+44+73+33
=104+103=104+103
=356
bài 2: rút gọn rồi tính
a) 8/5 -18/27 =.................................................. .................................................. b)12/20-6/18............................................ c)18/21-12/27...................................... d)8/12-20/50................................................. |
|
a: =8/5-2/3=24/15-10/15=14/15
12/20-6/18=3/5-1/3=9/15-5/15=4/15
b: 18/21-12/27=6/7-7/9=54/63-49/63=5/63
8/12-20/50=2/3-2/5=10/15-6/15=4/15
\(a,\dfrac{8}{5}-\dfrac{18}{27}=\dfrac{8}{5}-\dfrac{2}{3}=\dfrac{14}{15}\\ \dfrac{12}{20}-\dfrac{6}{18}=\dfrac{3}{5}-\dfrac{1}{3}=\dfrac{4}{15}\\ b,\dfrac{18}{21}-\dfrac{12}{27}=\dfrac{6}{7}-\dfrac{4}{9}=\dfrac{26}{63}\\ \dfrac{8}{12}-\dfrac{20}{50}=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{4}{15}\)
a) 8/5 -18/27 = 8/5 - 2/3 = 14/15 12/20 - 6/18 = 3/5 - 1/3 = 4/15 b) 18/21 - 12/27 = 6/7 - 4/9 = 26/63 8/12 - 20/50 = 2/3 - 2/5 = 4/15 |
rút gọn rồi tính
a) 4/5+3/15=
b) 2/3+32/24=
c) 5/6+15/18=
3. tính rồi rút gọn
a) 8/15+2/3 =
b) 3/7+4/8 =
trả lời có kết quả chính xác mình tick
1, Rút gọn rồi tính
a) \(\frac{4}{5}+\frac{3}{15}\)
= \(\frac{4}{5}+\frac{1}{5}\)
= \(\frac{5}{5}\)
= \(1\)
b) \(\frac{2}{3}+\frac{32}{24}\)
= \(\frac{2}{3}+\frac{4}{3}\)
= \(\frac{6}{3}\)
= \(2\)
c) \(\frac{5}{6}+\frac{15}{18}\)
= \(\frac{5}{6}+\frac{5}{6}\)
= \(\frac{10}{6}\)
= \(\frac{5}{3}\)
2, Tính rồi rút gọn
a) \(\frac{8}{15}+\frac{2}{3}\)
= \(\frac{8}{15}+\frac{10}{15}\)
= \(\frac{18}{15}\)
= \(\frac{6}{5}\)
b) \(\frac{3}{7}+\frac{4}{8}\)
= \(\frac{24}{56}+\frac{28}{56}\)
= \(\frac{52}{56}\)
= \(\frac{13}{14}\)
Đáp án:
a) 1
b) 2
c) 5/3
Bài 3.Tính rồi rút gọn
a)6/5
b) 13/14
a) 4/5+3/15=4/5+1/5=1
b) 2/3+32/24=2/3+4/3=2
c)5/6+15/18=5/6+5/6=5/3
3.
a)8/15+2/3=18/15=6/5
b)3/7+4/8=52/56=13/14
Nhớ k cho mình đó !
Đã hứa thì phải làm