a)-3 1/7.6/55.(-7/12)
b)18/39.(-1 5/8):(-6 3/4)
Những câu hỏi liên quan
bt.1 tính
a )-1/12 - (2 trên 5/8 - 1/3)
b 18/ 39 . (- 1 trên 5/8 ) : (-6 trên 3/4 )
c ) 0,75 -0,6 + 3/7 + 3/15 phần 2 ,75 - 2,2 + 11/7 +11/17
Tính nhanh
A=1×5×6+2×10×12+24×8×10/1×35+2×6×10+8×6×20
B=2006×2008-3/2005+2005×2008
C=18×123+9×4567×2+3×5310×6/1+4+7+.......+55+58-410
B=2006 * 2008 -3 / 2005 + 2005 * 2008
B=(2005+1)* 2008 -3 / 2005 +2005 *2008
B=2005 * 2008 + 2008 -3 / 2005 +2005*2008
B=2005 * 2008 + 2005 / 2005 +2005 * 2008
B= 1
Đúng 0
Bình luận (0)
20 tháng 7 2023 lúc 20:34
bài 3: Tính:
1) 1/6 - -5/6 2) 6/13 - -14/39 3) 4/5 - 4/-18 4) 7/21 - 9/-36
5) -12/18 - -21/35 6) -3/21 - 6/42 7) -18/24 - 15/21 8) 1/6 - 2/5
các bn giup mik mik vs
1)1/6 - - 5/6 = 1/6 + 5/6 = 1
2)6/13 - -14/39 = 6/13 + 14/39= 32/39
3)4/5 - 4/-18 = 4/5 + 4/18= 46/45
4)7/21 - 9/-36 = 7/21 + 9/36 = 7/12
5)-12/18 - -21/35 = -12/18 + 21/35 = -1/15
6)-3/21 - 6/42 = -2/7
7)-18/24 - 15/21 = -41/28
8)1/6 - 2/5 =-7/30
Đúng 2
Bình luận (0)
2/3 + 3/4
9/4 + 3/5
5/24 + 1/4
3/15 - 5/35 18/27 - 2/6 37/12 - 3
11/9 x 3/22 7/13 x 13/7 4 x6/7
2/5 : 3/10 3/8 : 9/4 8/21 : 4/7
2/3 + 3/4=17/12
9/4 + 3/5=57/20
5/24 + 1/4=11/24
3/15 - 5/35=2/35 18/27 - 2/6=1/3 37/12 - 3=1/12
11/9 x 3/22=1/6 7/13 x 13/7=1 4 x6/7=24/7
2/5 : 3/10=4/3 3/8 : 9/4=1/6 8/21 : 4/7=2/3
Đúng 5
Bình luận (1)
2/3 + 3/4
= 17/12
9/4 + 3/5
= 57/20
5/24 + 1/4
=11/24
3/15 - 5/35
=2/35
18/27 - 2/6
=1/3
37/12 - 3
= 1/12
11/9 x 3/22
=1/6
7/13 x 13/7
=1
4 x6/7
=24/7
2/5 : 3/10
=4/3
3/8 : 9/4
=1/6
8/21 : 4/7
= 2/3
Đúng 4
Bình luận (0)
1=17/12
2=57/20
3=11/24
4=2/35 7=1/3 10=1/12
5=1/6 8=1 11=24/7
6=4/3 9=1/6 12=2/3
Đúng 3
Bình luận (0)
bt.1 tính
a )-1/12 - (2 trên 5/8 - 1/3)
b 18/ 39 . (- 1 trên 5/8 ) : (-6 trên 3/4 )
c ) 0,75 -0,6 + 3/7 + 3/15 phần 2 ,75 - 2,2 + 11/7 +11/17
100 like
-12/18 + (-21)/35
-3/21 + 6/42
-18/24 + 15/21
1/6 + 2/5
3/5 + (-7)/4
(-2) + (-5)/8
1/-8 + (-5)/9
4/13 + 12/39
1/21 + 1/28
-3/29 + 16/58
8/40 + (-36)/45
-8/18 + (-15)/27
13/30 + (-1)/5
2/21 + 1/28
5 + (-3)/4
18/24 + 45/-10
câu 1)
\(\dfrac{-12}{18}+\left(\dfrac{-21}{35}\right)=\dfrac{-19}{15}\)
câu 2)
\(-\dfrac{3}{21}+\dfrac{6}{42}=0\)
câu 3)
\(-\dfrac{18}{24}+\dfrac{15}{21}=-\dfrac{1}{28}\)
câu 4)
\(\dfrac{1}{6}+\dfrac{2}{5}=\dfrac{17}{30}\)
câu 5)
\(\dfrac{3}{5}+\left(-\dfrac{7}{4}\right)=-\dfrac{23}{20}\)
câu 6)
\(\left(-2\right)+\left(\dfrac{-5}{8}\right)=\dfrac{-21}{8}\)
câu 7)
\(\dfrac{1}{-8}+\left(-\dfrac{5}{9}\right)=-\dfrac{49}{72}\)
câu 8)
\(\dfrac{4}{13}+\dfrac{12}{39}=\dfrac{8}{13}\)
câu 9)
\(\dfrac{1}{21}+\dfrac{1}{28}=\dfrac{1}{12}\)
câu 10)
\(-\dfrac{3}{29}+\dfrac{16}{58}=\dfrac{5}{29}\)
câu 11)
\(\dfrac{8}{40}+\left(-\dfrac{36}{45}\right)=-\dfrac{3}{5}\)
câu 12)
\(-\dfrac{8}{18}+\left(-\dfrac{15}{27}\right)=-1\)
câu 13)
\(\dfrac{13}{30}+\left(-\dfrac{1}{5}\right)=\dfrac{7}{30}\)
câu 14)
\(\dfrac{2}{21}+\dfrac{1}{28}=\dfrac{11}{84}\)
câu 15)
\(5+\left(-\dfrac{3}{4}\right)=\dfrac{17}{4}\)
câu 16)
\(\dfrac{18}{24}+\dfrac{45}{-10}=-\dfrac{15}{4}\)
Đúng 0
Bình luận (0)
Đúng ghi Đ sai ghi S:
a,5 x 7/18 + 2/9 = 5 x 11/18=55/18
b,3/4 x (2/9+5/6) = 3/4 x 2/9 +3/4 x 5/6=1/6 + 5/8=19/24
bt.1 tính
a )-1/12 - (2 trên 5/8 - 1/3)
b 18/ 39 . (- 1 trên 5/8 ) : (-6 trên 3/4 )
c ) 0,75 -0,6 + 3/7 + 3/15 phần 2 ,75 - 2,2 + 11/7 +11/17
So sánh A và B :
a,A=20/39+22/27+18/43,B=14/39+22/29+18/41
b,A=3/8^3+7/8^4,B=7/8^3+3/8^4
c,A=10^7+5/10^7-8,B=10^8+6/10-7
d,A=10^1992+1/10^1991+1,B=10^1993+1/10^1992+1