A=(9595+6855):(a-31)
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425:25+250x4-17
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b: D=(-3/31-28/31)+(-6/17-11/17)+(1/25-5/25)
=-2-4/25=-54/25
a: =25x100-150=2500-150=2350
c: \(=520:\left\{515\cdot25\right\}\)
=104/2575
a) \(31\cdot72+\left(-31\right)\cdot70-2\cdot70\)
\(=31\cdot72-31\cdot70-2\cdot70\)
\(=31\cdot\left(72-70\right)-2\cdot70\)
\(=31\cdot2-2\cdot70\)
\(=2\cdot\left(31-70\right)\)
\(=2\cdot-39\)
\(=-78\)
b) \(25\cdot\left(32+17\right)-32\cdot\left(25+47\right)\)
\(=25\cdot32+25\cdot17-32\cdot25-32\cdot47\)
\(=25\cdot\left(32-32+17\right)-32\cdot47\)
\(=25\cdot17-32\cdot47\)
\(=425-1504\)
\(=-1079\)
Trả lời
a) 9 . 24 . 25 = 9 . 600 = 5400
b) 12 . 125 . 54 = 1500 . 54 = 81000
c) 64 . 125 . 875 = 8000 . 875 = 7000000
d) 425 . 7 . 4 - 170 . 60 = 11900 - 10200 = 1700
e) 8 . 9 . 14 . 6 . 17 . 12 . 19 . 4 . 18 =
a) 93. 85+ 17. 45-170 = 93. 17. 5+ 17.9.5-17.5.2= 17.5.( 93+ 9-2)= 85. 100 = 8500
b) \(\left(\frac{-13}{31}:\frac{5}{17}+\frac{-18}{31}:\frac{5}{17}\right).\frac{25}{34}\)
\(=\left(\frac{-13}{31}.\frac{17}{5}+\frac{-18}{31}.\frac{17}{5}\right).\frac{25}{34}\)
\(=\left(\frac{-13}{31}+\frac{-18}{31}\right).\frac{17}{5}.\frac{25}{34}\)
\(=\left(-1\right).\frac{5}{2}\)
\(=\frac{-5}{2}\)
CHÚC BN HỌC TỐT!!
a, 98.85 + 17.45 - 170 = 116.3 - 170 = -53.7
b, (-13/31 : 5/17 + -18/31 : 5/17) x 25/34 = 17/5 x ( -13/31 + -18/31) x 25/34
=17/5 x -1 x 25/34 = -5/2 = -2.5