Tính ( một cách hợp lý )
33.(17-5) - 17. (33-5)
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a) \(18.17-3.6.7\)
\(=18.17-18.7\)
\(=18\left(17-7\right)\)
\(=18.10=180\)
c) \(33\left(17-5\right)-17.\left(33-5\right)\)
\(=33.17-33.5-17.33+5.17\)
\(=5\left(17-33\right)\)
\(=5.\left(-16\right)=-80\)
a, 18.17-3.6.7 b,54-6.(17+5) c,33.(17.5)-17.(33-5)
=18.17-18.7 =6.9-6.22 =33.17.5-17.(33-5)
=18.(17-17) =6.(9-22) =17.(33.5)-17.(33-5)
=18.10 =6.(-13) =17.165-17.28
=18.10 =6.(-13) =17.(165-28)
=180 =-78 =17.137
=2329
33.(17 – 5) – 17.(33 -5)
= 33. 17 – 33.5 – 17.33 + 17.5
= (33.17 – 33. 17) + ( 17.5 – 33.5)
= 0 + 5.(17- 33)
= 5.(- 16) = -80
\(a,18.17-3.6.7\)
\(=18.17-18.7\)
\(=18.\left(17-7\right)\)
\(=18.10\)
\(=180\)
\(b,54-6.\left(17+9\right)\)
\(=54-6.17+6.9\)
\(=54-102+54\)
\(=\left(54+54\right)-102\)
\(=108-102\)
\(=6\)
\(c,33.\left(17-5\right)-17.\left(33-5\right)\)
\(=33.17-33.5-17.33-17.5\)
\(=\left(33.17-17.33\right)-\left[5\left(33-17\right)\right]\)
\(=0-5.16\)
\(=-80\)
a.18.17-3.6.7
=18.17-18.7
=18.(17-7)
=18.10=180
b.54-6.(17+9)
=54-6.26
=54-156=-102
c.33.(17-5)-17.(33-5)
=33.17-33.5-17.33+17.5
=33.5+17.5
=(33+17).5
=50.5=250
a) \(=\left(\left(-\frac{1}{4}-\frac{5}{3}\right)+\frac{7}{33}\right)-\left(-\frac{15}{12}+\frac{6}{11}-\frac{48}{49}\right)\)
\(=\left(-\frac{23}{12}+\frac{7}{33}\right)+\frac{15}{12}-\frac{6}{11}+\frac{48}{49}\)
\(=\left(-\frac{23}{12}+\frac{15}{12}\right)+\left(\frac{9}{33}-\frac{6}{11}\right)+\frac{48}{49}\)
\(=-\frac{2}{3}-\frac{3}{11}+\frac{48}{49}\)
\(=\frac{65}{1617}\)
b) \(=\frac{11}{125}+\left(-\frac{17}{18}+\frac{4}{9}\right)+\left(-\frac{5}{7}+\frac{17}{14}\right)\)
\(=\frac{11}{125}-\frac{1}{2}+\frac{1}{2}\)
\(=\frac{11}{125}\)
a) 18.17 - 3.6.7
= 18.17-18.7
=18.( 17 - 7 )
= 18 . 10
= 180
b) 54 - 6.( 17 + 9)
= 6.9 - 6 . 26
= 6.( 9 - 26 )
= 6 . ( - 17 )
= -102
c) 33.(17 - 5 ) - 17.(33-5)
= 33.17 - 33 .3 - 17.33 - 17 . 5
= 33.17 + ( -33 ) .3 + ( - 17) .33 + ( -17) .5
= 33.17 + ( - 17) . 33 + 33 . ( - 3) + ( -17 ) .5
= 33. [ 17 + ( -17 ) + ( - 3 )] + (-17) . 5
= 33 . ( - 3 ) + ( -17 ) .5
= -99 + ( - 85)
= -184
a) 18 . 17 - 3 . 6 . 7 b) 54 - 6 . ( 17 + 9 )
= 306 - 126 = 48 . 26
= 180 = 1248
,mk giúp đc từng đó nha
a) \(25.\left(-7\right).4=\left(25.4\right).\left(-7\right)=100.\left(-7\right)=-700\)
b) \(33.\left(17-5\right)-17.\left(33-5\right)=33.17-33.5-17.33+17.5=5.\left(17-33\right)\)\(=5.\left(-16\right)=-80\)
\(\frac{17}{33}.\frac{2}{5}+\frac{3}{5}.\frac{17}{33}-\frac{17}{33}\)
\(=\frac{17}{33}\times\frac{2}{5}+\frac{3}{5}\times\frac{17}{33}-\frac{17}{33}\times1\)
\(=\frac{17}{33}\times\left(\frac{2}{5}+\frac{3}{5}-1\right)\)
\(=\frac{17}{33}\times\left(1-1\right)\)
\(=\frac{17}{33}\times0=\frac{17}{33}\)
33.(17-5) - 17. (33-5)
=33.17-33.5-17.33+17.5
=16.5
=90
33.(17-5) - 17. (33-5)
=33.17-33.5-17.33+17.5
=16.5
=90
tick nhé