1 + 4 = 5 2 + 7 = 12 3 + 6 = 21 8 + 11 = ??
[ giúp mình nhé ]
1)(-5)+(-7)+(-8)+(-3)
2)(-4)+(-2)+(-5)+(-6)
3)(-8)+(-11)+(-4)+(-2)
4)(-9)+(-15)+(-6)+(-3)
5)(-12)+(-9)+(-15)+(-9)+(-3)+(-8)
6)(-14)+(-7)+(-12)+(-21)
giải hộ mình nhé
1 + 4 = 5
2+5= 12
3+6=21
8 + 11 =?
các bạn giúp mình nhé
Bài 1:Tính
a,3/2+5/4+5/8
b,4/5-3/8+2/4
c,3+6/8-5/4
d,5/6-1/2+2
e,3/5+6/11+7/13+2/5+16/11+19/13
g,75/100+18/21+29/32+1/4+3/21+13/32
Giusp mình nhé
a.\(\dfrac{27}{8}\)
b.\(\dfrac{37}{40}\)
c.\(\dfrac{5}{2}\)
d.\(\dfrac{7}{3}\)
e.5
g.\(\dfrac{53}{16}\)
Bài 1 :
a) \(\dfrac{3}{2}+\dfrac{5}{4}+\dfrac{5}{8}=\dfrac{12}{8}+\dfrac{10}{8}+\dfrac{5}{8}=\dfrac{12+10+5}{8}=\dfrac{27}{8}\)
b) \(\dfrac{4}{5}-\dfrac{3}{8}+\dfrac{2}{4}=\dfrac{32}{40}-\dfrac{15}{40}+\dfrac{20}{40}=\dfrac{32-15+20}{40}=\dfrac{37}{40}\)
c) \(3+\dfrac{6}{8}-\dfrac{5}{4}=\dfrac{3}{1}+\dfrac{6}{8}-\dfrac{5}{4}=\dfrac{24}{8}+\dfrac{6}{8}-\dfrac{10}{8}=\dfrac{20}{8}=\dfrac{5}{2}\)
d) \(\dfrac{5}{6}-\dfrac{1}{2}+2=\dfrac{5}{6}-\dfrac{1}{2}+\dfrac{2}{1}=\dfrac{5}{6}-\dfrac{3}{6}+\dfrac{12}{6}=\dfrac{14}{6}=\dfrac{7}{3}\)
e) \(\dfrac{3}{5}+\dfrac{6}{11}+\dfrac{7}{13}+\dfrac{2}{5}+\dfrac{16}{11}+\dfrac{19}{13}=\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\left(\dfrac{6}{11}+\dfrac{16}{11}\right)+\left(\dfrac{7}{13}+\dfrac{19}{13}\right)=1+2+2=5\)
g) \(\dfrac{75}{100}+\dfrac{18}{21}+\dfrac{29}{32}+\dfrac{1}{4}+\dfrac{3}{21}+\dfrac{13}{32}=\dfrac{3}{4}+\dfrac{6}{7}+\dfrac{29}{32}+\dfrac{1}{4}+\dfrac{1}{7}+\dfrac{13}{32}=\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{6}{7}+\dfrac{1}{7}\right)+\left(\dfrac{29}{32}+\dfrac{13}{32}\right)=1+1+\dfrac{21}{16}=2+\dfrac{21}{16}=\dfrac{53}{16}\)
a,3/2+5/4+5/8 = 12/8 + 10/8 + 5/8 = 27/8
b,4/5-3/8+2/4 = 32/40 - 15/40 + 20/40 = 37/40
c,3+6/8-5/4= 24/8 + 6/8 - 10/8 = 20/8 = 5/2
d,5/6-1/2+2 = 5/6 - 3/6 + 12/6 = 14/6 = 7/3
e,3/5+6/11+7/13+2/5+16/11+19/13 = ( 3/5+ 2/5) + ( 6/11 + 16/11) + ( 7/13 + 19/13) = 1 + 2 + 2 = 5
g,75/100+18/21+29/32+1/4+3/21+13/32 = 3/4 + 6/7 + 29/32 + 1/4 + 1/7 + 13/32= ( 3/4 + 1/4) + ( 29/32 + 13/32) + ( 6/7 + 1/7)= 1 + 21/16 + 1 = 53/16
giúp mình câu này nha, nó ở trong sách luyện toán trang 12 nhé !
1) tính: a.8/5 - 5/6 x 3/4 b.7/8 + 5/6 : 2/3
2)tìm x: a)4/5 + x = 11/10 b)x - 3/4 = 5/7
1. a
\(\dfrac{8}{5}-\dfrac{5}{6}\cdot\dfrac{3}{4}\)
\(=\dfrac{8}{5}-\dfrac{5\cdot3}{3\cdot2\cdot4}\)
\(=\dfrac{8}{5}-\dfrac{5}{8}=\dfrac{39}{40}\)
1.b
\(=\dfrac{7}{8}+\dfrac{5}{6}\cdot\dfrac{3}{2}\)
\(=\dfrac{7}{8}+\dfrac{5\cdot3}{3\cdot2\cdot2}\)
\(=\dfrac{7}{8}+\dfrac{5}{4}=\dfrac{17}{8}\)
2.a
\(\dfrac{4}{5}+x=\dfrac{11}{10}\)
\(x=\dfrac{11}{10}-\dfrac{4}{5}=\dfrac{3}{10}\)
2.b
\(x-\dfrac{3}{4}=\dfrac{5}{7}\)
\(x=\dfrac{5}{7}+\dfrac{3}{4}=\dfrac{41}{28}\)
thực hiện phép tính:
a. -1 / 21 + -1 / 28 - -1 / 21 - 3/14
b. ( -1/5 + 3/12 ) + -3/4
c.75% - 1 1/2 + 0,5 : 5/12
d.-4/11 . 2/5 + 6/11 . (-3)/10
e.( 2/3 - 1 1/2 ) : 4/3 + 1/2
f. 1/8.15 2/5 + 1 4/5. 1/8 - 17 1/5 . 1/8
g.1/7 - 8/7 : 8- 3 : 3/4 . (-2)2
giúp mình nha . Cảm ơn !
tính :
a, 7/4 + 5/-6+21/8
b,4/9+ (-7)/12 +8/15
c,-1/3 + 2 5/6 + 19/12
giúp mình với
Lời giải:
a.
$\frac{7}{4}+\frac{5}{-6}+\frac{21}{8}=\frac{42}{24}+\frac{-20}{24}+\frac{63}{24}=\frac{85}{24}$
b.
$\frac{4}{9}+\frac{-7}{12}+\frac{8}{15}$
$=\frac{80}{180}+\frac{-105}{180}+\frac{96}{180}=\frac{71}{180}$
c.
$=\frac{-1}{3}+\frac{5}{6}+\frac{19}{12}+2$
$=\frac{-4}{12}+\frac{10}{12}+\frac{19}{12}+2=\frac{25}{12}+2=\frac{49}{12}$
1 -2 -3 +4 + 5 - 6 - 7 + 8 + 9 - 10 - 11 + 12 + ... + 100 + 101 các bạn giúp mình giải nhé !
bạn ghép 4 số đầu lại có kết quả là -8x325=-2600
\(1-2-3+4+5-6-7+8+...+97-98-99+100+101\)
\(=\left(1-2-3+4\right)+\left(5-6-7+8\right)+...+\left(97-98-99+100\right)+101\)
\(=0+0+...+0+101\)
\(=101\)
minh biet roi bang 101
13 -12+11 -9+8-7-6+5-4+3+2-1
giúp với mình đang cần gấp help me
mình sẽ tick nhé
KANZAKI MIZUKI GIẢI TRINH TỰ HỘ MÌNH VỚI
BẠN GIỎI TOÁN NHƯ VẬY GIÚP MÌNH VỚI
a) 1125- ( 374+1125) + (-65 + 374) = ? 13-12+11+10-9+8-7-6+5-4+3+2-1 = ? Giải các bước giúp mình nhé Mình cảm ơn