Tính nhanh
a) ( 9/15 + 8/11 ) + 6/15
b) ( 26/17 + 15/34 ) + ( 8/17 + 19/34 )
Những câu hỏi liên quan
(9/15+ 8/11) + 6/15=
(26/17+15/34) + ( 8/17 + 19/34) =
\(\left(\frac{9}{15}+\frac{8}{11}\right)+\frac{6}{15}=\left(\frac{9}{15}+\frac{6}{15}\right)+\frac{8}{11}\)
\(=1+\frac{8}{11}=\frac{19}{11}\)
\(\left(\frac{26}{17}+\frac{15}{34}\right)+\left(\frac{8}{17}+\frac{19}{34}\right)=\left(\frac{26}{17}+\frac{8}{17}\right)+\left(\frac{15}{34}+\frac{19}{34}\right)\)
\(=2+1=3\)
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\(\left(\frac{9}{15}+\frac{8}{11}\right)+\frac{6}{15}\)
\(=\left(\frac{9}{15}+\frac{6}{15}\right)+\frac{8}{11}\)
\(=1+\frac{8}{11}\)
\(=\frac{19}{11}\)
\(\left(\frac{26}{17}+\frac{15}{34}\right)+\left(\frac{8}{17}+\frac{19}{34}\right)\)
\(=\frac{26}{17}+\frac{15}{34}+\frac{8}{17}+\frac{19}{34}\)
\(=\left(\frac{26}{17}+\frac{8}{17}\right)+\left(\frac{15}{34}+\frac{19}{34}\right)\)
\(=2+1\)
\(=3\)
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4.24.5^2-(3^3.18+3^3.12)
31.15.7^2.4-31.49.40
1+2+3+4+5+6+7+8+9+10
1+3+5+7+9+11+13+15+19
2+6+10+14+22+23+26+34
5+8+11+14+17+20+23+26+29
1+6+11+16+21+26+31+36+41+47+51
10+13+16+19+22+25+28+31+34+37+40
5+7+9+11+13+15+17+3+8+13+18+23+28
4+7+10+13+16+19+5+9+13+17+21+25
4.24.52-(33.18+33.12)
=4.24.25-[27.(18+12)]
=(4.25).24-[27.30]
=100.24-810
=2400-810
=1590
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4.24.5^2-(3^3.18+3^3.12)
31.15.7^2.4-31.49.40
1+2+3+4+5+6+7+8+9+10
1+3+5+7+9+11+13+15+19
2+6+10+14+22+23+26+34
5+8+11+14+17+20+23+26+29
1+6+11+16+21+26+31+36+41+47+51
10+13+16+19+22+25+28+31+34+37+40
5+7+9+11+13+15+17+3+8+13+18+23+28
4+7+10+13+16+19+5+9+13+17+21+25 = 1590
#HT#
bài 437 Tính nhanh 13. -3/11 . -22/66 . 121/15 17. 1/3 . 4/5 + 1/3 . 6/5 18. 6/7 . 8/13 +6/13 . 9/7 - 3/13 . 6/7 19. -1/4 . 152/11 + 68/4 . -1/11 20. 3/7 . 9/26 - 1/14 . 1/13 21. 15(1/5 - 7/15) 22. 34(2và1/17 - 3và5/34)
Giúp mình với ạ
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37=
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37
=(1+37)x37:2
=703
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Xem thêm câu trả lời
số nguyên:
15 - ( -15 + 2)
(-14) - (17 - 8)
15 - ( 21- 7)
34 + (-15) - 17
(-34) + ( -12) + 18
27 - 15 - 19
34 - ( -15) +8
-37 + 13 - 25
40 - 17 + ( -25)
16 + (-15 ) - 18
15 - 14 - 13
-27 + 15 -17
34 - 71
28 - 125
13 + ( -27)
14 - (-34)
28 - (-16)
-15 -8
-27 -34
-25 - (-18)
46 - 25 - (-25)
-37 - (-24)
46 - (-15)
-26 - 6 + 7
Đọc tiếp
số nguyên:
15 - ( -15 + 2)=
(-14) - (17 - 8)=
15 - ( 21- 7)=
34 + (-15) - 17=
(-34) + ( -12) + 18=
27 - 15 - 19=
34 - ( -15) +8=
-37 + 13 - 25=
40 - 17 + ( -25)=
16 + (-15 ) - 18=
15 - 14 - 13=
-27 + 15 -17=
34 - 71=
28 - 125=
13 + ( -27)=
14 - (-34)=
28 - (-16)=
-15 -8 =
-27 -34=
-25 - (-18)=
46 - 25 - (-25)=
-37 - (-24)=
46 - (-15)=
-26 - 6 + 7 =
15 - (-15 + 2) = 15 + 13 = 28
(-14) - (17 - 8) = -14 - 9 = -23
15 - (21- 7) = 15 - 14 = 1
34 + (-15) - 17 = 19 - 17 = 2
(-34) + (-12) + 18 = -46 + 18 = -28
27 - 15 - 19 = 12 - 19 = -7
34 - (-15) + 8 = 49 + 8 = 57
-37 + 13 - 25 = -24 - 25 = -49
40 - 17 + (-25) = 23 + (-25) = -2
16 + (-15) - 18 = 1 - 18 = -17
15 - 14 - 13 = 1 - 13 = -12
-27 + 15 - 17 = -12 - 17 = -29
34 - 71 = -37
28 - 125 = -97
13 + (-27) = -14
14 - (-34) = 48
28 - (-16) = 44
-15 - 8 = -23
-27 - 34 = -61
-25 - (-18) = -7
46 - 25 - (-25) = 21 + 25 = 46
-37 - (-24) = -13
46 - (-15) = 61
-26 - 6 + 7 = -32 + 7 = -25
@linhcute
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BÀI 1 : thực hiện phép tính a)35/17+-9/5+-18/17+4/5 b)-7/19 nhân 3/17+-7/19 nhân 8/11+7/9 c)26/15+-17/3+-6/13-11/15 d)-3/14 nhân 4/13+-3/14 nhân 9/13+3/4 e).31/17+-5/13+-8/13-14/17 f)-5/7 nhân 2/11+-5/11 nhân 9/11 cộng 5/7
Xem chi tiết
a: =35/17-18/17-9/5+4/5
=1-1=0
b: =-7/19(3/17+8/11-1)
=7/19*18/187=126/3553
c: =26/15-11/15-17/3-6/13
=1-6/13-17/3
=7/13-17/3=-200/39
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Điền dấu : >,<,=
a,5/3 x 7/10 .... 5/7 : 7/10
b, 4/5 x 5/6 ..... 8/9 : 4/3
c, 5/11 x 33/15 ..... 6/17 x 34/25
d, 15/19 x 38/5 ..... 15/16 : 3/8
Mong mn làm giúp ạ
a: \(\dfrac{5}{3}\cdot\dfrac{7}{10}=\dfrac{5}{10}\cdot\dfrac{7}{3}=\dfrac{14}{3}>2\)
\(\dfrac{5}{7}:\dfrac{7}{10}=\dfrac{5}{7}\cdot\dfrac{10}{7}=\dfrac{50}{49}< 2\)
=>\(\dfrac{5}{3}\cdot\dfrac{7}{10}>\dfrac{5}{7}:\dfrac{7}{10}\)
b: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{4}{6}=\dfrac{2}{3}\)
\(\dfrac{8}{9}:\dfrac{4}{3}=\dfrac{8}{9}\cdot\dfrac{3}{4}=\dfrac{8}{4}\cdot\dfrac{3}{9}=\dfrac{2}{3}\)
Do đó: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{8}{9}:\dfrac{4}{3}\)
c: \(\dfrac{5}{11}\cdot\dfrac{33}{15}=\dfrac{5}{15}\cdot\dfrac{33}{11}=\dfrac{3}{3}=1\)
\(\dfrac{6}{17}\cdot\dfrac{34}{25}=\dfrac{34}{17}\cdot\dfrac{6}{25}=2\cdot\dfrac{6}{25}=\dfrac{12}{25}< 1\)
=>\(\dfrac{5}{11}\cdot\dfrac{33}{15}>\dfrac{6}{17}\cdot\dfrac{34}{25}\)
d: \(\dfrac{15}{19}\cdot\dfrac{38}{5}=\dfrac{15}{5}\cdot\dfrac{38}{19}=3\cdot2=6\)
\(\dfrac{15}{16}:\dfrac{3}{8}=\dfrac{15}{16}\cdot\dfrac{8}{3}=\dfrac{15}{3}\cdot\dfrac{8}{16}=\dfrac{5}{2}\)<6
=>\(\dfrac{15}{19}\cdot\dfrac{38}{5}>\dfrac{15}{16}:\dfrac{3}{8}\)
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1.Tìm các số nguyên x:
5/17+-4/9+-20/31+12/17+-11/31<x<=-3/7+7/15+4/-7+8/15+2/3
2. Tính
A=5-10/19+15/143-5/81+8-16/26+24/243-8/181
6-12/19+18/143-6/81+9-18/26+27/243-9/181
Bai3: Tính
b. 4 x 6 x 10 x 12 x 15/ 4 x 12 x 5 x 24 x 30 =
c. 34 x 101 x 2005/ 17 x 202 x 4010=
d.6 x 8 x 11 x 13 x 17/ 33 x 16 x 17 x 26 =
b. \(\dfrac{4.2.3.5.2.6.2.5.3}{4.3.4.5.6.4.5.6}=\dfrac{1}{4}\)
c. \(\dfrac{17.2.101.2005}{17.2.101.2.2005}=\dfrac{1}{2}\)
d. \(\dfrac{2.3.4.2.11.13.17}{3.11.4.4.17.13.2}=\dfrac{1}{2}\)
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a)\(\dfrac{4\times6\times10\times12\times15}{4\times12\times5\times24\times30}=\dfrac{2}{2\times2\times2}=\dfrac{2}{8}=\dfrac{1}{4}\)
b)\(\dfrac{34\times101\times2005}{17\times202\times4010}=\dfrac{2}{2\times2}=\dfrac{2}{4}=\dfrac{1}{2}\)
c)\(\dfrac{6\times8\times11\times13\times17}{33\times16\times17\times26}=\dfrac{6}{3\times2\times2}=\dfrac{1}{2}\)
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