𝐴=16−15+14−13 +...+ 4 −3+2−1
[13/2 + 14/6] - [5/15 + 1/3]
4/16 + 3/4 + 4/16 - 3/4
[35/70 - 2/10] + [14/8 - 1]
1/ ( \(\frac{13}{2}\)+ \(\frac{14}{6}\)) - ( \(\frac{5}{15}\) + \(\frac{1}{3}\))
= \(\frac{53}{6}\) - \(\frac{2}{3}\)
= \(\frac{49}{6}\)
2/ \(\frac{4}{16}\)+ \(\frac{3}{4}\)+ \(\frac{4}{16}\) - \(\frac{3}{4}\)
= \(\frac{1}{2}\)
3/ ( \(\frac{35}{70}\)- \(\frac{2}{10}\)) + ( \(\frac{14}{8}\)-1)
= \(\frac{3}{10}\)+ \(\frac{3}{4}\)
= \(\frac{21}{20}\)
k cho mk nha
Bài 13: Dấu <, =, >
10 … 10 + 3
11 + 2…. 2 + 11
9 … 10 + 9
10 … 10 + 0
17 – 4 … 14 - 3
18 – 4 … 12
15 … 15 – 1
17 + 1… 17 + 2
12+ 5 … 16
16 … 19 - 3
15 – 4 … 10 + 1
19 – 3 … 11
10 < 10 + 3
11 + 2=2 + 11
9 < 10 + 9
10 = 10 + 0
17 – 4 > 14 - 3
18 – 4 >12
15 > 15 – 1
17 + 1<17 + 2
12+ 5 > 16
16 =19 - 3
15 – 4 =10 + 1
19 – 3 >11
1+2+3+4+...+11/13+14+15+16+...+23
Tính:
12 + 3 = 13 + 6 = 12 + 1 =
14 + 4 = 12 + 2 = 16 + 2 =
13 + 0 = 10 + 5 = 15 + 0 =
12 + 3 = 15 13 + 6 = 19 12 + 1 = 13
14 + 4 = 18 12 + 2 = 14 16 + 2 = 18
13 + 0 = 13 10 + 5 = 15 15 + 0 = 15
12 + 3 = 15 13 + 6 = 19 12 + 1 = 13
14 + 4 = 18 12 + 2 = 14 16 + 2 = 18
13 + 0 = 13 10 + 5 = 15 15 + 0 = 15
(1/18+2/17+3/16+4/15+5/14+4/13+ ...+18/1+18)/1/18
Tìm x , biết
(518/19-342/13)(3/4+19/59-3/118) / (tất cả) (3/4+x) 27/33= 1/13×16+1/14×17 / ( tất Cả ) 1/13×15+1/14×16+1/15×17
Hơi Rối Mong Mọi Người Giúp Đỡ Ạ
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Viết lại đề lại sách nháp đi
\(\Rightarrow\frac{\left(\frac{518}{19}-\frac{342}{13}\right).\left(\frac{253}{236}-\frac{3}{318}\right)}{\left(\frac{3}{4}+x\right)\frac{27}{33}}\)=\(\frac{\frac{1}{3}.\frac{3}{36}+\frac{1}{3}.\frac{3}{14.17}}{\frac{1}{2}.\frac{2}{13.15}+\frac{1}{2}.\frac{2}{14.16}}\)
\(\frac{\frac{236}{2247}.\frac{247}{236}}{\left(\frac{3}{4}+x\right)\frac{27}{33}}\)=\(\frac{\frac{1}{3}.\left(\frac{1}{13}-\frac{1}{16}+\frac{1}{14}-\frac{1}{17}\right)}{\frac{1}{2}\left(\frac{1}{13}+\frac{1}{14}-\frac{1}{16}-\frac{1}{17}\right)}\)
\(\frac{1}{\left(\frac{3}{4}+x\right)\frac{27}{33}}\)=\(\frac{\frac{1}{3}}{\frac{1}{2}}\)
đến đây tự làm nhé cứ ra 13/12 là được
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+16+12345678
bài1
1) (-4/15)(-25/8)
2) 5/-14(-7/10)
3) -15/4(-16/25
4) 15(13/10
5) -21/9*-6/14
1)\(\dfrac{5}{6}\)
2)\(\dfrac{1}{4}\)
3)\(\dfrac{12}{5}\)
4)\(\dfrac{39}{2}\)
5)\(1\)
Tính nhẩm:
15 - 5 = 11 - 1 = 16 - 3 =
12 - 2 = 18 - 8 = 14 - 4 =
13 - 2 = 17 - 4 = 19 - 9 =
15 - 5 = 10 11 - 1 = 10 16 - 3 = 13
12 - 2 = 10 18 - 8 = 10 14 - 4 = 10
13 - 2 = 11 17 - 4 = 13 19 - 9 = 10