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

Toán Lớp 6: Bài 1: Tính giá trị các biểu thức sau (Tính nhanh nếu có thể). 34322 4 2 c.4.2 -3 :3 +25 :5 d. 2.5 -[131–(13-4) ] e. 500 – {5[409 – (2

Toán Lớp 6: Bài 1: Tính giá trị các biểu thức sau (Tính nhanh nếu có thể).
34322 4 2 c.4.2 -3 :3 +25 :5 d. 2.5 -[131–(13-4) ]
e. 500 – {5[409 – (23.3 – 21)2] – 1724}

Comments ( 2 )

  1. c)4.2 -3 :3 +25 :5
    =8-1+5
    =12
    d)2.5 -[131–(13-4) ]
    =10-[131-9]
    =10-122
    =-112
    e)500 – {5[409 – (23.3 – 21)2] – 1724}
    =500-{5[409-(69-21)2]-1724}
    =500-{5[409-48.2]-1724}
    =500-{5[409-96]-1724}
    =500-{5.313-1724}
    =500-{1565-1724}
    =500-(-159)
    =659

  2. $\text{c) 4.2 – 3: 3 + 25 : 5 }$
    $\text{= 8 – 1 + 5 }$
    $\text{= 12 }$
    $\text{d) 2.5 – [ 131 – ( 13 – 4 ) ] }$
    $\text{= 10 – ( 131 – 9 ) }$
    $\text{= 10 – 122 }$
    $\text{= -112 }$
    $\text{e) 500 – { 5[ 409 – ( 23.3 – 21 ). 2] -1724 } }$
    $\text{= 500 – [ 5. ( 409 – 48. 2 ) – 1724 ] }$
    $\text{= 500 – ( 5. 313 – 1724 ) }$
    $\text{= 500 – ( -159 ) }$
    $\text{= 500 + 159 }$
    $\text{= 659 }$

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

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