12/27+7/27+8/27 bằng mấy?
Phân số \(\dfrac{4}{9}\)bằng phân số nào dưới đây:
a. \(\dfrac{8}{27}\)
b. \(\dfrac{16}{27}\)
c. \(\dfrac{12}{18}\)
d. \(\dfrac{12}{27}\)
Tính bằng cách hợp lí nhất:
a, 7/5 + 7/2 + 8/5 + 12/13 + 1/2 + 27/13
\(\dfrac{7}{5}+\dfrac{8}{5}+\dfrac{7}{2}+\dfrac{1}{2}+\dfrac{12}{13}+\dfrac{27}{13}=\dfrac{15}{5}+\dfrac{8}{2}+\dfrac{39}{13}=3+4+3=10\)
a) \(\dfrac{7}{5}+\dfrac{7}{2}+\dfrac{8}{5}+\dfrac{12}{13}+\dfrac{1}{2}+\dfrac{27}{13}=\left(\dfrac{7}{5}+\dfrac{8}{5}\right)+\left(\dfrac{7}{2}+\dfrac{1}{2}\right)+\left(\dfrac{12}{13}+\dfrac{27}{13}\right)\)\(=3+4+3=10\)
= ( 7/5+ 8/5) + ( 7/2+ 1/2) + ( 12/13+ 27/13)
= 3 + 4+ 3
= 10
\(\dfrac{-1}{3}.\dfrac{2}{5}\)
\(\dfrac{-3}{7}.\dfrac{4}{15}\)
\(\dfrac{-9}{3}.\dfrac{15}{27}\)
\(\dfrac{-5}{6}.\)( -12 )
\(\dfrac{-12}{4}.\dfrac{8}{9}\)
\(-3.\dfrac{7}{6}\)
\(\dfrac{-15}{9}.\dfrac{27}{5}\)
\(-9.\dfrac{4}{27}\)
-2/15
-4/35
-5/3
10
-8/3
-7/2
-9
-4/3
Chúc em học giỏi
\(=\dfrac{-2}{15}\\ =\dfrac{-4}{35}\\ =-1\\ =10\\ =\dfrac{-8}{3}\\ =-7\\ =-9\\ =\dfrac{-4}{3}\)
Câu 1 : Thực hiện phép tính :
a, ( -25 ) . ( -7 ) .4 .3
b, -27 - ( 15 - 64 ) + ( 15 + 27 )
c, 8 . ( 12 + 35 ) - 12 . ( 8 - 35 )
M=230.57+213.527/227 . 57+210.527 : 814/1612
M=230.57/227.57+210.527:814/1612
Tính nhanh lớp 4 nha các bạn
8/27+4/5+19/27+11/15
12/13+2/7+8/13+6/13+5/7
8/27+4/5+19/27+11/15=(8/27+19/27) + (4/5+11/15)
= 1+ (12/15+11/15)
= 1+ 1/8/15=2/8/15
12/13+2/7+8/13+6/13+5/7=(12/13+8/13+6/13) + (2/7+5/7)
= 2+ 1
=3
Ý a có thể bạn chép nhầm 4/5 rồi
= 2 + 1=3 nhé bạn
5/6 + 7/12=
5/8 - 2/5=
27/24 - 7/8 =
5/6 + 7/12 = 17/12
5/8 - 2/5 = 9/40
27/24 - 7/8 = 1/4
Hok tốt!
phân số 4/9 bằng phân số nào ?
A.8/27 B.16/27 C.12/27 D.12/18
Tính:
a) 2^5 x 13^12 x 7^8 : 27 x 13^10 x 7^9
b) 2^n x 11 x 3 : 6^n x 3
c) 5^5 x 7 x 9^5 : 15^10
d) 7 x 8^10 x 27^9 - 8 x 9^13 x 2^27 : 7 x 6^26 x 2^2 - 2^4 x 8^3 x 27^9
e) 2^2^1^2015
f) 2015^0^2015^0^2015