1+9+2+8+3+74+6+5=?????????
giúp mk với na
giúp mk với
tính
hỗn số 4 và 5/7 : 1 và 5/6 + 2 và 7/15 x 21/74
[ ví dụ : 3 và 8/10 là hỗn số nhé ]
\(4\frac{5}{7}:1=\frac{33}{7}:1==\frac{33}{7}\)
\(\frac{5}{6}+2=\frac{5}{6}+\frac{12}{6}=\frac{17}{6}\)
\(\frac{7}{15}x\frac{21}{74}=\frac{7}{3x5}x\frac{3x7}{74}=\frac{7x7}{5x74}=\frac{49}{370}\)
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9 +1028 giúp mk nha
1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1+2+3+4+5+6+7+8+9+1028=(1+2+3+4+5+6+7+8+9)x3+1028=45x3+1028=135+1028=1163
= ( 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 ) x 3 +1028
\(=\) \(\frac{9.\left(9+1\right)}{2}\times3+1028\)
\(=45\times3+1028\)
\(=135+1028=1163\)
1+2+3+4+5+6+7+8+9=???
Giúp mk với mk đang cần gấp!!!
1+2+3+4+5+6+7+8+9
=(1+9)+(2+8)+(3+7)+(4+6)+5
=10+10+10+10+5
=10×4+5
=40+5
=45
Học tốt
= (1+9) + (2+8) + ( 3+7 ) + (4+6) + 5
= 10+10+10+10+5
= 10*4+5
=40+5
=45
=( 1+ 9) +( 2+8) +(3+ 7) +(4+ 6) + 5
=10 + 10 + 10 + 10 + 5
=10 x 4 + 5
=45
Giúp mk với
1+2-3+4-5+6-7+8-9+.......+998-999+1000
500500 dung 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
Tính:
1, 3 1/2 + 4 3/5
2, 3/4 + 6 5/8
3, 5 3/8 + 9 2/7
4, 4 1/2 - 2 3/10
1: =7/2+23/5=35/10+46/10=81/10
2: =6/8+53/8=59/8
3: =43/8+65/7=821/56
Tính:
1, 3 1/2 + 4 3/5
2, 3/4 + 6 5/8
3, 5 3/8 + 9 2/7
4, 4 1/2 - 2 3/10
\(a,3\dfrac{1}{2}+4\dfrac{3}{5}=\dfrac{81}{10}\\ b,\dfrac{3}{4}+6\dfrac{5}{8}=\dfrac{59}{8}\\ 5\dfrac{3}{8}+9\dfrac{2}{7}=\dfrac{821}{56}\\ 4,4\dfrac{1}{2}-2\dfrac{3}{10}=\dfrac{11}{5}\)
rút gọn p/s
A=3469-54/6938-108
B=2468-98/3702/147
C=1010/1008*8-994
D=1*2*3+2*4*6+3*6*9+5*10*15/1*3*6+2*6*12+3*9*18+5*15*30
ai giúp mk với ai nhanh mk sẽ tick cho nha!
\(A=\frac{3469-54}{6938-108}\)
\(=\frac{3415}{6830}\)
\(=\frac{3415}{6830}=\frac{3415:3415}{6830:3415}=\frac{1}{2}=\frac{3}{6}\)
\(B=\frac{2468-89}{3720-147}\)
\(=\frac{2370}{3555}\)
\(=\frac{2370}{3555}=\frac{2370:1185}{3555:1185}=\frac{2}{3}=\frac{4}{6}\)
tính 1 2 3 4 5 6 7 8 9 10 11 12 ..... 2015 2016 giúp mk với đang cần gấp
-1/39 + -1/52
-6/9 + -12/16
-2/5 - -3/11 -34/37 - 74/-85
-5/9 : -7/18
Giúp tớ với!! 3h10 đi học rồi
\(\frac{-1}{39}+\frac{-1}{52}=\frac{-7}{156}\)
\(\frac{-6}{9}+\frac{12}{16}=\frac{-2}{3}+\frac{3}{4}=\frac{1}{12}\)
\(\frac{-2}{5}-\frac{-3}{11}-\frac{34}{37}-\frac{74}{-85}=\frac{-1215}{6919}\)
\(\frac{-5}{9}:\frac{-7}{18}=\frac{-5}{9}.\frac{-18}{7}=\frac{10}{7}\)