1. Tính 27 x 75 + 25 x 27 – 150 3 x 5 ² – 16 : 2 ² 20 – [ 30 – ( 5 – 1 ) ² ] 60 : {[( 12 – 3 )x 2] + 2 }

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1. a)27×75+25×27-150

   =27x(75+25)-150

   =27×100-150

   =2700-150

   =2550

   b)3×5^2-16:2^2

   =3×25-16:4

   =75-4

   =71

   c)20-{[30-(5-1)x2]+2}

   =20-{[30-4×2]+2}

   =20-{[30-8]+2}

   =20-{22+2}

   =20-24

   =-4

   d)60:{[(12-3)x2]+2}

   =60:{[9×2]+2}

   =60:{18+2}

   =60:20

   =3

   Cho mình ctlhn nhé

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2. $27 \times 75 + 25 \times 27 – 150$

   $= 27 \times 75 + 25 \times 27 – 150$

   $= 27 \times (75 + 25) – 150 $

   $= 27 \times 100 – 150$

   $= 2700 – 150$

   $= 2550$.

   $3 \times 5^2 – 16 : 2^2$

   $= 3 \times 25 – 16 : 4$

   $= 75 – 4$

   $= 71$.

   $20 – [30 – (5-1)^2]$

   $= 20 – (30 – 4^2)$

   $= 20 – 30 + 16$

   $= 6$.

   $60 : {[( 12 – 3) \times 2] + 2}$

   $= 60 : (9 \times 2 + 2)$

   $= 60 : 20$

   $= 3$.

    

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