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A, Câu này thì tớ chưa rõ lắm
B, 47 - [ ( 45 . 2^4 - 5^2 . 12 ) : 14] =
= 47 - [ ( 45. 16 - 25 . 12 ) : 14]
= 47 - [ ( 720 - 300 ) : 14]
= 47 - [ 420 : 14 ]
= 47 - 30
= 17
Chúc bạn học giỏi! :^
#Coffee
A=50-[(50-2^3.5):2+3] B=47-[(45.2^4-5^2.12):14]
=50-[(50-40):2+3] =47-[(45.16-25.12):14]
=50-(10:2+3) =47-[(720-300):14]
=50-(5+3) =47-[420:14]
=50-8=42 =47-30=17
k tcik
b1: a, 612.(15+19-34)=612.0=0
b,414.(37.4+23.4-240)=414.0=0
c,(517.125-518.25)+63:23=(517.53-518.52)+33=0+27=27
b2:a,143+7.(n-17)=206
===> 7.(n-17)=206-143=63
====>n-17=63:7=9
=====>n=9+17=26
vậy n=26
b,128-28:(15-n)=124
====>28:(15-n)=128-124=4
=====> 15-n=28:4=7
=====> n=15-7=8
vậy n=8
c,3n.2+48=210
====>3n.2=210-48=162
====>3n=162:2=81=34
====>n=4
vậy n=4
a, \(\frac{3}{8}+\frac{11}{13}-\frac{9}{13}\)
=\(\frac{3}{8}+\frac{2}{13}\)
=\(\frac{55}{104}.\)
b, \(\frac{2}{7}.\left(\frac{5}{9}+\frac{4}{9}\right)+\frac{2}{7}\)
=\(\frac{2}{7}.\frac{9}{9}+\frac{2}{7}\)
=\(\frac{2}{7}+\frac{2}{7}\)
=\(\frac{4}{7}\)
c, \(\frac{3}{11}.\left(\frac{3}{5}-\frac{5}{3}\right)-\frac{3}{10}.\left(\frac{1}{3}-\frac{2}{5}\right)\)
=\(\frac{3}{11}.-\frac{16}{15}-\frac{3}{10}.-\frac{1}{15}\)
=\(-\frac{16}{55}--\frac{1}{50}\)
=\(-\frac{149}{550}.\)
d, \(\frac{-3}{4}.\frac{11}{23}+\frac{3}{23}.\frac{31}{17}-\frac{3}{17}.\frac{19}{23}\)
=\(-\frac{33}{92}+\frac{93}{391}-\frac{57}{391}\)
=\(-\frac{417}{1564}\)
e, \(\frac{3}{17}.\frac{11}{23}+\frac{3}{23}.\frac{31}{17}-\frac{3}{17}.\frac{19}{23}\)
=\(\frac{33}{391}+\frac{93}{391}--\frac{254}{391}\)
=\(\frac{380}{391}.\)
g, \(\frac{3}{7}.\frac{-5}{12}+\frac{11}{17}:\frac{5}{-12}\)
=\(-\frac{5}{28}+-\frac{132}{85}\)
= \(-1.731512605.\)
k cho mình nha làm mỏi tay quá ,.....................kết bạn với mình nha.......................
692 + 152 - 92
= (692 - 92) + 152
= 600 + 152
752
Tính nhanh 692+152−92
692+152−92=(692−92)+152=600+152=752 ( Đúng )
\(692+152-92=692-92-152=600-152=752\)( Sai )
\(\frac{22}{45}\)< \(\frac{51}{101}\)
\(\frac{23}{48}\)< \(\frac{47}{92}\)
\(\frac{34}{43}\)< \(\frac{35}{42}\)
\(\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{200.201}\)
\(=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{200}-\frac{1}{201}\)
\(=\frac{1}{2}-\frac{1}{201}\)
\(=\frac{201}{402}-\frac{2}{402}\)
\(=\frac{199}{402}\)
46 x 182 - 23 x 72 - 92 x 23
= (23 x 2) x 182 - 23 x 72 - 92 x 23
= 23 x (2 x 182) - 23 x 72 - 92 x 23
= 23 x 364 - 23 x 72 - 92 x 23
= 23 x (364 - 72 - 92)
= 23 x 200
= 4600
46x 182 - 23 x 72 - 92 x 23
= 46 x 182 - 23 x 2 x 36 - 46 x 2 x 23
= 46 x 182 - 46 x 36 - 46 x 46
= 46 x ( 182 - 36 - 46 )
= 46 x 100
= 4600
k mình nhee