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

Toán Lớp 5: Tính nhanh : a ) 3 x ( 36,2 – 6,52 ) + 7 x 36,2 + 3 x 0,52

Toán Lớp 5: Tính nhanh :
a ) 3 x ( 36,2 – 6,52 ) + 7 x 36,2 + 3 x 0,52

Comments ( 2 )

  1. 3xx(36,2-6,52)+7xx36,2+3xx 0,52
    =3xx36,2 – 3xx 6,52 + 7xx36,2 + 3xx0,52
    =(3xx36,2 + 7 xx 36,2)-(3xx 6,52 – 3xx 0,52)
    =36,2xx(3+7)-3xx(6,52 – 0,52)
    =36,2 xx 10 – 3 xx 6
    =362-18
    =344

  2. Lời giải chi tiết:
    3xx(36,2-6,52)+7xx36,2+3xx0,52
    =3xx(36,2-6,52+0,52)+7xx36,2
    =3xx(36,2-6)+7xx36,2
    =3xx36,2-3xx6+7xx36,2
    =36,2xx(3+7)-3xx6
    =36,2xx10-18
    =362-18
    =344

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

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