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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: 25 x (-1/5) mũ 3 + 1/5 -2 x (-1/2)mũ 3 – 1/2 giúp newbie với ạ

Toán Lớp 7: 25 x (-1/5) mũ 3 + 1/5 -2 x (-1/2)mũ 3 – 1/2
giúp newbie với ạ

Comments ( 2 )

  1. 25xx(-1/5)^3+1/5-2xx(-1/2)^3-1/2
    =25xx[(-1)xx(1/5)^3]+1/5-2xx[(-1)xx(1/2)^3]-1/2
    =(-25)xx1/125+1/5+2xx1/8-1/2
    =(-1)/5+1/5+1/4-1/2
    =-1/4

  2. 25 xx ( ( – 1 )/5 )^3 + 1/5 – 2 xx ( ( – 1 )/2 )^3 – 1/2
    = 25 xx ( – 1 )/125 + 1/5 – 2 xx ( – 1 )/8 – 1/2
    = ( – 1 )/5 + 1/5 – ( – 1 )/4 – 1/2
    = ( ( – 1 )/5 + 1/5 ) – ( ( – 1 )/4 + 1/2 )
    = 0 – 1/4
    = ( – 1 )/4

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222-9+11+12:2*14+14 = ? ( )