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

Toán Lớp 6: B1: Tính hợp lí a. 45 + (-28 ) + ( -6 ) +27 + 11 + (-35 ) b. 305 + ( -246 ) + ( -105 ) + 546 c. 257 × 4 + 215 × 35 – 217 × 35 d. (-2

Toán Lớp 6: B1: Tính hợp lí
a. 45 + (-28 ) + ( -6 ) +27 + 11 + (-35 )
b. 305 + ( -246 ) + ( -105 ) + 546
c. 257 × 4 + 215 × 35 – 217 × 35
d. (-27 ) × ( 30 – 15 ) + 15 × ( 30 – 27 ) – 30 × ( 5 – 27 )
Giải chi tiết giúp mik vs

Comments ( 2 )

  1. $a. 45 + (-28 ) + ( -6 ) +27 + 11 + (-35 )$
    $=[45+(-35)]+[(-28+27)]+[(-6)+11]$
    $=10+(-1)+5$
    $=14$
    $b. 305 + ( -246 ) + ( -105 ) + 546 $
    $=[305+(-105)]+[(-246)+546]$
    $=200+300$
    $=500$
    $c. 257 × 4 + 215 × 35 – 217 × 35$
    $=1028+7525-7595$
    $=8553-7595$
    $=958$
    $d. (-27 ) × ( 30 – 15 ) + 15 × ( 30 – 27 ) – 30 × ( 5 – 27 ) $
    $=(-27) × 15 + 15 × 3 – 30 × (-22)$
    $=(-405)+45+660$
    $=(-360)+660$
    $=300$
     

  2. text(Bài 1 🙂
    a)
    45 + (-28 ) + ( -6 ) +27 + 11 + (-35 )
    = 45 – 28 – 6 + 27 + 11 – 35
    = (45 – 35) – (28 – 27) + (-6 + 11)
    = 10 – 1 + 5
    = 14
    b)
    305 + ( -246 ) + ( -105 ) + 546
    = 305 – 246 – 105 + 546
    = (305 – 105) + (546 – 246)
    = 200 + 300
    = 500
    c)
    257 × 4 + 215 × 35 – 217 × 35
    = 1028 + 35 × (215 – 217)
    = 1028 + 35 × (-2)
    = 1028 – 70
    = 958
    d)
    (-27 ) × ( 30 – 15 ) + 15 × ( 30 – 27 ) – 30 × ( 5 – 27 )
    = (-27) × 15 + 15 × 3 – 30 × (-22)
    = (-27) × 15 + 15 × 3 – 15 × (-44)
    = 15 × (-27 + 3 + 44)
    = 15 × 20
    = 300

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