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

Toán Lớp 6: Rút gọn biểu thức: a) x+51+(-56)+24 b) (-65)–(x+27)+26 c) 813-(813–x)+213 d) 125-(125–x)+22

Toán Lớp 6: Rút gọn biểu thức:
a) x+51+(-56)+24
b) (-65)–(x+27)+26
c) 813-(813–x)+213
d) 125-(125–x)+22

Comments ( 2 )

  1. a) $x+51+(-56)+24$
    $=x+51-56+24$
    $=x+19$
    b) $(-65)-(x+27)+26$
    $=-65-x-27+26$
    $=-x-65$
    c) $813-(813-x)+213$
    $=813-813+x+213$
    $=x+213$
    d) $125-(125-x)+22$
    $=125-125+x+22$
    $=x+22$

  2. a) x + 51 + (-56) + 24
    = x + 51 – 56 + 24
    = x + 19
    b) (-65) – (x + 27) + 26
    = -65 – x – 27 + 26
    =  -x – 66
    c) 813 – (813 – x) + 213
    = 813 – 813 + x + 213
    = x + 213
    d) 125 – (125 – x) + 22 
    = 125 – 125 + x + 22
    = x + 22 
    / học tốt /
     

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

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