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a. 8 x 37 x 5 x 25 = (8 x 25) x 37 x 5
= 200 x 5 x 37 = 1000 x 37 = 37000
b. 48 x 34 + 6 x 66 x 8 = 48 x 34 + 48 x 66 = 48 x ( 34 + 66) = 48 x 100 = 4800
c. 17 x (13 - 5) + 17 x 5 = 17 x 8 + 17 x 5 = 17 x (8 + 5) = 17 x 13 = 221
d. 78 x 100 - 100 = 78 x 100 - 100 x 1 = 100(78 - 1) = 100 x 77 = 7700
e. 6 x 17 x 8 + 3 x 37 x 16 + 4 x 46 x 12
= 48 x 17 + 48 x 37 + 48 x 46
= 48 x (17 + 37 + 46)
= 48 x 100 = 4800
f. 47 x 43 + 47 x 73 - 8 x 47 x 2 = 47 x 43 + 47 x 73 - 47 x 16 = 47 x (43 + 73 - 16) = 47 x 100 = 4700
8×37×5×25=296×5×25=1480×25=37000
48×34+6×66×8=1632+396×8=1632+3168=4800
15×(13-7)+17×5=15×6+17×5=90+85=175
78×100-100=7800-100=7700
a)12 x 18 + 14 x 3 - 255 : 17=25.58823529411765
b)68 + 42 x 5 - 625 : 25=5182
c) 13+ 21 x 5 - (198 : 11 - 8)=108
d) 1188 - 4 x (27 + 90 + 73 :10 )=
e) 5 + 8 + 11 + 14 +......+ 38 + 41=
f) 51 - 49 + 55 - 53 + 59 - 56 + 63 - 61 + 65=74
có mấy câu mình ko biết,xin lỗi bạn
a)\(\frac{21}{11}.\frac{22}{17}.\frac{68}{63}=\frac{21.22.68}{11.17.63}=\frac{21.2.11.4.17}{11.17.3.21}=\frac{\left(11.17.21\right)2.4}{\left(11.17.21\right).3}=\frac{2.4}{3}=\frac{8}{3}\)
b)\(\frac{5}{14}.\frac{7}{13}.\frac{26}{25}=\frac{5.7.26}{14.13.25}=\frac{5.7.13.2}{7.2.13.5.5}=\frac{\left(5.7.13\right).2}{\left(5.7.13\right).2.5}=\frac{2}{2.5}=\frac{1}{5}\)
\(\frac{38}{11}+\frac{4}{17}-\frac{5}{11}-\frac{3}{17}\)
\(=\frac{38}{11}-\frac{5}{11}+\frac{4}{17}-\frac{3}{17}\)
\(=\frac{33}{11}+\frac{1}{17}\)
\(=3+\frac{1}{17}\)
\(=\frac{52}{17}\)
38/11+4/17-5/11-3/17
=(38/11-5/11)+(4/17-3/17)
=3+1/17
=51/17+1/17=52/17
a)2 + 5 + 11 + ... + 47+ 95
Tính chất : 5 = 2.2 + 1
11 = 5.2 + 1
Vậy các số của dãy là: 2 + 5 + 7 + 11 + 23 + 47 + 95
= (2 + 5 + 7) + (5 + 95) + (23 + 47)
= 14 + 100 + 70
= 184
1km 95 m = 1095 m
1,95km =1950m
\(1\frac{95}{100}\)km = 1950 m
\(53.39+47.39-53.21+47.21\)
\(=39.\left(53-39\right)-\left(53-47\right).21\)
\(=39.14-6.21\)
\(=39.7.2-6.2.7\)
\(=7.2.\left(39-6\right)\)
\(=14.33\)
2,4 x 95 + ( 9,6 + 2,4 ) = 2,4 x 95 + 12 = 2,4 x 95 + 2,4 x 5
= 2,4 x ( 95 + 5 ) = 2,4 x 100 = 240
a) Tìm x
\(\frac{8}{5}+x=\frac{17}{3}\)
\(\Rightarrow x=\frac{17}{3}-\frac{8}{5}\)
\(\Rightarrow x=\frac{61}{15}\)
\(x-\frac{17}{14}=\frac{80}{11}\)
\(\Rightarrow x=\frac{80}{11}+\frac{17}{14}\)
\(\Rightarrow x=\frac{1307}{154}\)
b) Tính nhanh
\(52\times95+47\times95+95\)
\(=95\times\left(52+47+1\right)\)
\(=95\times100\)
\(=9500\)
\(a.\)\(\frac{8}{5}+x=\frac{17}{3}\)
\(\Leftrightarrow x=\frac{17}{3}-\frac{8}{5}\)
\(\Leftrightarrow x=\frac{85}{15}-\frac{24}{15}\)
\(\Leftrightarrow x=\frac{61}{15}\)
\(x-\frac{17}{14}=\frac{80}{11}\)
\(\Leftrightarrow x=\frac{80}{11}+\frac{17}{14}\)
\(\Leftrightarrow x=\frac{1120}{154}+\frac{187}{154}\)
\(\Leftrightarrow x=\frac{1307}{154}\)
\(b.\)Cách tính nhanh nhé:
\(52.95+47.95+95\)
\(=52.95+47.95+95.1\)
\(=95.\left(52+47+1\right)\)
\(=95.100\)
\(=9500\)
~ Rất vui vì giúp đc bn ~