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42 . 52 - ( 20150 + 8 ) : 32
= 16 . 25 - (1 + 8) : 9
= 16 . 25 - 9 : 9
= 16 . 25 - 1
= 400 -1
=399
\(=20^2-\left(1+8\right):3^2\)
\(=400-9:9\)
\(=400-1=399\)
k cho mình nha cảm ơn nhìu
a/ ta có : 5.(27-17)2 - 611 : 69 = 5.102 - 611 :69
= 5.100 - 611-9 = 500 - 36 = 464
b/ ta có : (-15)+(-17) = -15 - 17 = -32
c/ ta có : 21.42 + 21.59 +21.52 = 21.(42 +59 +52 )
= 21. (16 + 59 + 25) = 21.100=2100
d/ ta có : 75 - (3.52 - 4.23 ) +20150 = 75 - (3.25 - 4.8) +1
= 75 - 43 +1 = 33
\(3^3\cdot5^3-20\cdot\left\{300-\left[546-2^3\cdot\left(7^8-7^6+7^0\right)\right]\right\}\)
\(=3^3\cdot5^3-20\cdot\left\{300-\left[546-2^3\cdot5647153\right]\right\}\)
\(=3^3\cdot5^3-20\cdot\left\{300-\left[546-45177224\right]\right\}\)
\(=3^3\cdot5^3-20\cdot\left\{300--45176678\right\}\)
\(=3^3\cdot5^3-20\cdot45176978\)
\(=3375-903539560\)
\(=-903536185\)
\(626500:\left\{50^2:\left[178-4\cdot\left(35-21:3\right)\right]\right\}\)
\(=626500:\left\{50^2:\left[178-4\cdot\left(35-7\right)\right]\right\}\)
\(=626500:\left\{50^2:\left[178-4\cdot28\right]\right\}\)
\(=626500:\left\{50^2:\left[178-112\right]\right\}\)
\(=626500:\left\{50^2:66\right\}\)
\(=626500:\frac{1250}{33}\)
\(=\frac{82698}{5}\)
CHUC BAN HOC TOT >.<
a) 600:{300:[200 - (30 + 8.20)]}
= 600:{300:[200 - 190]}
= 600:{300 : 10}
= 600 : 30
= 20
b) 42.53 - (20150 + 8) : 32
= 16.125 - (1 + 8) : 9
= 2000 - 1
= 1999
c) 25.75 + 25.16 + 5.45
= 25.75 + 25.16 + 5.5.9
= 25.75 + 25.16 + 25.9
= 25.(75 + 16 + 9)
= 25.100
= 2500
c)
25.75+25.16+5.45
=25.75+25.16+5.(5.9)
=25.75+25.16+5.5.9
=25.75+25.16+25.9
=25.(75+16+9)
=25.100
=2500