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

Toán Lớp 6: thực hiện phép tính(tính nhanh nếu có thể) a) (-20) x 5 : (-4) b) 19 – 42 c) 75 – (-38)+(-12) d) 128 : 4 + 3 x (50-14) e) (-23) x 45 +

Toán Lớp 6: thực hiện phép tính(tính nhanh nếu có thể)
a) (-20) x 5 : (-4)
b) 19 – 42
c) 75 – (-38)+(-12)
d) 128 : 4 + 3 x (50-14)
e) (-23) x 45 + 23 x (-54) – 23
f) 21 : [(1245+987) : 2^3 -15 x 12] + 21

Comments ( 2 )

  1. a,
    (-20)×5:(-4)
    =(-20):(-4)×5
    =5×5
    =25
    b,
    19-42
    =-23
    c,
    75-(-38)+(-12)
    =75+38-12
    =113-12
    =101
    d,
    128:4+3×(50-14)
    =32+3×36
    =32+108
    =140
    e,
    (-23)×45+23×(-54)-23
    =(-23)×45+(-23)×54-23
    =(-23)(45+54+1)
    =(-23)×100
    =-2300
    f,
    21:[(1245+987):2^3-15×12]+21
    =21:(2232:8-180)+21
    =21:(279-180)+21
    =21:99+21
    =0,21+21
    =0,42

  2. Lời giải chi tiết:
    a) (-20)xx5:(-4)
    =[(-20):(-4)]xx5
    =5xx5
    =25
    b) 19-42
    =-(42-19)
    =-23
    c) 75-(-38)+(-12)
    =75+38-12
    =113-12
    =101
    d) 128:4+3xx(50-14)
    =32+3xx36
    =32+108
    =140
    e) (-23)xx45+23xx(-54)-23
    =23xx(-45)+23xx(-54)-23
    =23xx[(-45)+(-54)-1]
    =23xx(-100)
    =-2300
    f) 21:[(1245+987):2^3-15xx12]+21
    =21:(2232:8-180)+21
    =21:(279-180)+21
    =21:99+21
    =7/33+21
    =700/33

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