tính:
a).3/4+1/6
b.11/12-3/4
c.11/12-1/6
d.1/6+3/4
làm đầy đủ ms tick
tính:
a).2/5+1/2+7/10
b).4/9+11/8-5/6
c).9/20-8/15x5/12
d).2/3:4/5:7/12
làm đầy đủ phép tính+ cách tính đầy đủ tick
a) 2/5 + 1/2 + 7/10
= 4/10 + 5/10 + 7/10
= 9/10 + 7/10
= 16/10 = 8/5
b) 4/9 + 11/8 - 5/6
= 32/72 + 99/72 - 60/72
= 191/72
c) 9/20 - 8/15 x 5/12
= 9/20 - 2/9
= 41/180
d) 2/3 : 4/5 : 7/12
= 5/6 : 7/12
= 10/7
a,2/5+1/2+7/10
=4/10+5/10+7/10
=16/10
=8/5
b,4/9+11/8-5/6
=32/72+99/72-5/6
=131/72-5/6
=131/72-60/72
=71/72
c,9/20-8/15x5/12
=9/20-2/9
=41/180
d,2/3:4/5:7/12
=2/5x5/4x12/7
=6/7
Bài 1.(1 điểm) Thực hiện phép tính:
a) A= 3/4 + -5/6
b) B= 3/13. 6/11 + 3/13. 9/11-3/13.4/11
gấp giúp em với ạ
các ông bà làm bài này tính rồi rút gọn đầy đủ dùm con nhé.đừng ghi luôn kết quả ko rút gọn con bực mình thấy mồ
3/4+1/6
11/12-3/4
11/12-1/6
1/6+3/4
\(\frac{3}{4}+\frac{1}{6}=\frac{9+2}{12}=\frac{11}{12}\)
\(\frac{11}{12}-\frac{3}{4}=\frac{11-9}{12}=\frac{2}{12}=\frac{1}{6}\)
\(\frac{11}{12}-\frac{1}{6}=\frac{11-2}{12}=\frac{9}{12}=\frac{3}{4}\)
\(\frac{1}{6}+\frac{3}{4}=\frac{2+9}{12}=\frac{11}{12}\)
Thực hiện phép tính :
a, 4/5 + 1/5 : (-2/15)
b, -7/12 . 3/11 + -7/12 . - 14/11 + | -5/6 |
Tìm x :
a, x - 3/5 x = 2/5
b, 2/7 + 5/7 : x = 1 1/7
Ai giúp mình với, pleasee làm đầy đủ cả 2 bài mình tick. Cần gấp
\(\frac{4}{5}\)+ \(\frac{1}{5}\): \(\frac{-2}{15}\)= \(\frac{4}{5}\)+ \(\frac{1}{5}\)* \(\frac{-15}{2}\)=\(\frac{4}{5}\) + \(\frac{-3}{2}\)= \(\frac{-7}{10}\)
b = \(\frac{-7}{12}\). (\(\frac{3}{11}\)+ \(\frac{-14}{11}\)) + \(\frac{5}{6}\)= \(\frac{-7}{12}\). (-1) + \(\frac{5}{6}\)= \(\frac{7}{12}\)+ \(\frac{10}{12}\)= \(\frac{17}{12}\)
x-\(\frac{3}{5}\)x = \(\frac{2}{5}\)
=> x.(1-\(\frac{3}{5}\)) =\(\frac{2}{5}\)
=> x. \(\frac{2}{5}\)= \(\frac{2}{5}\)
=> x=1
Vậy x=1
Tính:
a) \(\dfrac{-1}{2}+\dfrac{5}{6}+\dfrac{1}{3}\);
b) \(\dfrac{-3}{8}+\dfrac{7}{4}-\dfrac{1}{12}\);
c) \(\dfrac{3}{5}:\left(\dfrac{1}{4}\cdot\dfrac{7}{5}\right)\);
d) \(\dfrac{10}{11}+\dfrac{4}{11}:4-\dfrac{1}{8}\).
a: \(\dfrac{-1}{2}+\dfrac{5}{6}+\dfrac{1}{3}\)
\(=\dfrac{-3}{6}+\dfrac{5}{6}+\dfrac{2}{6}\)
\(=\dfrac{4}{6}=\dfrac{2}{3}\)
b: \(\dfrac{-3}{8}+\dfrac{7}{4}-\dfrac{1}{12}\)
\(=\dfrac{-9}{24}+\dfrac{42}{24}-\dfrac{2}{24}\)
\(=\dfrac{31}{24}\)
c: \(\dfrac{3}{5}:\left(\dfrac{1}{4}\cdot\dfrac{7}{5}\right)=\dfrac{3}{4}:\dfrac{7}{20}=\dfrac{3}{4}\cdot\dfrac{20}{7}=\dfrac{15}{7}\)
d: \(\dfrac{10}{11}+\dfrac{4}{11}:4-\dfrac{1}{8}\)
\(=\dfrac{10}{11}+\dfrac{1}{11}-\dfrac{1}{8}=\dfrac{7}{8}\)
1.Tinh nhanh :
13 - 12 +11 +10 - 9 +8 -7 -6 +5 -4 + 3 +2 -1
Cc giup mk vs , ms sẽ tick cho
13 - 12 + 11 + 10 - 9 + 8 - 7 -6+ 5 -4 + 3 + 2 -1
= 13 - ( 12 - 11 - 10 + 9 ) + ( 8-7-6+ 5 ) - ( 4 - 3 - 2 + 1 )
= 13 - 0 + 0 -0
=13
Học tốt !
Tính:A=1+2-3-4+5+6-7-8+9+10-11-12+.....+97+98-99-100
\(\text{A = 1-2-3-4+5-6-7-8+9-10-11-12+...........+97-98-99-100}\)
\(\text{A =(1-2-3-4)+(5-6-7-8)+(9-10-11-12)+.............+(97-98-99-100)}\)
\(\text{A =-8+(-16)+(-24)+..................+(-200)}\)
\(\text{A =-8.(1+2+3+......+25)}\)
\(\text{A =-8.[(25-1):1+1.26:2]}\)
\(\text{A =-8.325}\)
\(\text{A =-2600 Vậy A = -2600 }\)
=1+(2-3-4+5)+(6-7-8+9)+...+(98-99-100+101)+102
=1+0+0+0+....+102
=103
k mk nha
ne bang 153 dung khong nhi
153 ddddo
đầy đủ nhé mn, trả lời đủ em tick
a, 4/11 + 6/11 b, 28/8 x 12/6 c, 7/4 - 5/8 d, 3/5 : 3/7
a: 4/11+6/11=10/11
b: 28/8x12/6=7/2x2=7
c: =14/8-5/8=9/8
d: =3/5x7/3=7/5
Tính:A=(-1).(-1)2.(-1)3.(-1)4.....(-1)2114
C=13-12+11+10-9+8-7-6+5-4+3+2-1