hừm

c) (-37) – 14 – 26 + 37=(-37)+37-14-26=0-(-12)=12
d) 34 + 35 + 36 + 37 – 14 – 15 – 16 – 17 =(34-14)+(35-15)+(36-16)+(37-17)=20+20+20+20=80

\(C=\dfrac{2}{5}+\dfrac{1}{5}.\left(-\dfrac{3}{4}\right)\)

\(C=\dfrac{2}{5}+\left(-\dfrac{3}{20}\right)\)

\(C=\dfrac{1}{4}\)

\(E=2:\left(\dfrac{1}{2}-\dfrac{2}{3}\right)^3\)

\(E=2:\left(-\dfrac{1}{6}\right)^3\)

\(E=2:\left(-\dfrac{1}{216}\right)\)

\(E=-432\)

a) 81000

b)7000000

12.125.54=1500.54

              =81000

64.125.875=8000.875

                =7000000

ko hiểu

a, 997 + 37 = 1034

b, 1354 - 996 = 358

c, 9 . 24 . 25 = 5400

d, 12 . 125 . 54 = 81000

e, 64 . 125 . 875 = 7000000

a) 997+37=1034

b) 1354-996=358

c)9x24x25=5400

d)12x125x54=81000

e)64x125x875=7000000

\(C=\dfrac{2014\left(2015^2+2016\right)-2016\left(2015^2-2014\right)}{2014\left(2013^2-2012\right)-2012\left(2013^2+2014\right)}\)

\(=\dfrac{2.2014.2016+2014.2015^2-2016.2015^2}{2014.2013^2-2012.2013^2-2.2012.2014}\)

\(=\dfrac{2.\left(2015+1\right)\left(2015-1\right)-2.2015^2}{2.2013^2-2.\left(2013+1\right)\left(2013-1\right)}\)

\(=\dfrac{2.\left(2015^2-1\right)-2.2015^2}{2.2013^2-2.\left(2013^2-1\right)}=\dfrac{-2}{2}=-1\)

a) 9 . 24 . 25

= 9 . 600

= 5400

b) 12 . 125 . 5 = (12 . 5) . 125

= 60 . 125 =7500

c) 64 . 125 . 875= 8000 . 875 = 7000000

d) 425 . 7 . 4 - 170 . 60 = 1700 . 7 - 170 . 60

= 170 . (10 . 7) - 170 . 60

= 170 . 70 - 170 . 60

= 170 . (70 - 60)

= 170 . 10 = 1700

a, 9 . 24. 25 = 9. ( 25.24 ) = 9 . 600 = 5400

b, 12.125.5 = 1500.5 = 7500

c , 64 . 125 . 5 = ( 64 . 125 ) . 5 = 8000 . 5 = 40000

d, 425 . 7 . 4 - 170 . 60 = 1700 . 7 - 10200 = 11900 - 10200 = 1700

e , 8.9.14 + 6 . 7 .13 + 19 . 4 . 18 = 1008 + 546 + 1368 = 2922

\(8.9.14+6.7.12+19.4.18\)

\(=8.3.3.14+42.12+19.2.2.18\)

\(=24.42+42.12+38.36\)

\(=42.\left(24+12\right)+38.36\)

\(=42.36+38.36\)

\(=36.\left(42+38\right)\)

\(=36.90\)

\(=3240\)

 Bài 1 :

a) 12 x 125 x 54 = 1 500 x 54 = 81 000

b) 64 x 125 x 875 = 8 000 x 875 = 7 000 000

c) 425 x 7 x 4 - 170 x 60 = 11 900 - 10 200 = 1 700

d) 8 x 9 x 14 + 6 x 17 x 12 +19 x 4 x18 = 1 008 + 1 224 + 1 368 = 3 600

câu 3 :S=(1.5.6+2.10.12+4.20.24+9.45.54):(1.3.5+2.6.10+9.27.45)

             =(1.5.6+1.5.6.8+1.5.6.64+1.5.6.729):(1.3.5+1.3.5.8+1.3.5.64+1.3.5.729)

             =[1.5.6.(1+8+64+729)]:[1.3.5.(1+8+64+729)]

             =(1.5.6):(1.3.5)=2

1)

a,46+17+57      b,4.25+25.2     k rồi làm tiếp

=46+74             =100.50   

=120                = 5000  

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