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

Toán Lớp 6: B1 : Tính hợp lý a. (1/4 + -5/13) + ( 2/11 + -8/13 + 3/4 ) b. (21/31 + -16/7 ) + (44/53 + 10/31 ) +9/53 c. 31/23 – ( 7/23 + 8/23 ) d

Tháng Mười Hai 18, 2022 Toán học 1 Comment 0 views

Toán Lớp 6: B1 : Tính hợp lý
a. (1/4 + -5/13) + ( 2/11 + -8/13 + 3/4 )
b. (21/31 + -16/7 ) + (44/53 + 10/31 ) +9/53
c. 31/23 – ( 7/23 + 8/23 )
d. (1/3 + 12/67 + 13/41) – ( 79/67 – 28/41)

Comments ( 1 )

  1. tuenhioanh
    tuenhioanh
    18 Tháng Mười Hai, 2022 at 11:54 sáng
    Reply
    a)(1/4 + -5/13) + ( 2/11 + -8/13 + 3/4 )
    =1/4+(-5/13)+2/11+(-8/13)+3/4
    =(1/4+3/4)+(-5/13+ -8/13)+2/11
    =1+ -1+2/11
    =2/11
    b) (21/31 + -16/7 ) + (44/53 + 10/31 ) +9/53
    =21/31+ -16/7 +44/53+10/31+9/53
    =(21/31+10/31)+(44/53+9/53)+ -16/7
    =1+1+ -16/7
    =-2/7
    c) 31/23 – ( 7/23 + 8/23 )
    =31/23-15/23
    =16/23
    d) (1/3 + 12/67 + 13/41) – ( 79/67 – 28/41)
    =1/3 + 12/67 + 13/41-79/67-28/41
    =1/3+(12/67-79/67)+(13/41+28/41)
    =1/3+ -1+1
    =1/3

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

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