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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) \(18.17-3.6.7\)
\(=18.17-18.7\)
\(=18\left(17-7\right)\)
\(=18.10=180\)
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
b) 54-6(17+9)=6.9-6.17-6.9=(6.9-6.9)-17.6=0-102=-102
c) =33.17-33.5-17.33+17.5=33.(17-17)-5.(33-17)=33.0-5.16=0-80=-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)=18.17-18.7
=18.(17-7)=18.10=180
b)=54-(6.17+6.9)=54-102-54=(54-54)-102=0-102=-102
c)=(33.17-33.5)-(17.33-17.5)=33.17-33.5-17.33+17.5=(33.17-17.33)-5.(33-17)=0-80=-80
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) (-5) + (-248) = - (|-5| + |-248|) = - (5 + 248) = -253.
b) 17 + |-33| = 17 + 33 = 50.
c) |-37| + |15| = 37 + 15 = 52.
a) (-5) + (-258)
= -263
b) 17 + |-33|
= 17 + 33
= 50
c) |-37| + |+15|
= 37 + 15
= 52
1. Tính hợp lí
a) \(0,7+\dfrac{-7}{19}-\left(-0,3\right)\)
\(=\dfrac{7}{10}+\dfrac{-7}{19}+\dfrac{3}{10}\)
\(=\left(\dfrac{7}{10}+\dfrac{3}{10}\right)+\dfrac{-7}{19}\)
\(=1+\dfrac{-7}{19}\)
\(=\dfrac{12}{19}\)
b) \(\dfrac{5}{3}.\left(-2,5\right):\dfrac{5}{6}\)
\(=\dfrac{5}{3}.\dfrac{-5}{2}.\dfrac{6}{5}\)
\(=\left(\dfrac{5}{3}.\dfrac{6}{5}\right).\dfrac{-5}{2}\)
\(=2.\dfrac{-5}{2}\)
\(=-5\)
c) \(0,6.\dfrac{-5}{17}-\dfrac{3}{5}.\dfrac{12}{17}\)
\(=\dfrac{3}{5}.\dfrac{-5}{17}-\dfrac{3}{5}.\dfrac{12}{17}\)
\(=\dfrac{3}{5}.\left(\dfrac{-5}{17}-\dfrac{12}{17}\right)\)
\(=\dfrac{3}{5}.-1\)
\(=\dfrac{-3}{5}\)
d) \(\dfrac{7}{4}.\dfrac{5}{2}-\dfrac{7}{4}.\dfrac{3}{2}\)
\(=\dfrac{7}{4}.\left(\dfrac{5}{2}-\dfrac{3}{2}\right)\)
\(=\dfrac{7}{4}.1\)
\(=\dfrac{7}{4}\)
Chúc bạn học tốt
a) 18.17−3.6.7
= 18.17 - 18 . 7
= 18 ( 17 - 7 )
= 18 . 10 = 180
b) 54−6.(17+9)
= 54 - 102 - 54
= - 102
c) 33.(17−5)−17.(33−5)
= 33. 17 - 33. 5 - 17 .33 + 17 . 5
= 17 . 5 - 33 . 5
= 5 ( 17 - 33 )
= 5. (-16)
= - 80
a) 18.17 - 3.6.7
= 18.17 - 18.7
= 18.(17 - 7 )
= 18 . 10
= 180
b) 54 - 6.(17 + 9)
= 6.9 - 6.17 + 6.9
= (6.9 - 6.9) - 6.17
= 0 - 6.17
= 0 - 102
= -102
c) 33.(17 - 5) - 17.(33 - 5)
= 33.17 - 33.5 - 17 . 33 - 17.5
= 33.(17 - 17) - 5.(33 - 17 )
= 33. 0 - 5.16
= 0 - 80
= -80