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

Toán Lớp 7: cho a/b=c/d CMR a/a-c=b/b-d a/c=a+b/c+d

Home/ Toán Lớp 7: cho a/b=c/d CMR a/a-c=b/b-d a/c=a+b/c+d

Toán Lớp 7: cho a/b=c/d CMR a/a-c=b/b-d a/c=a+b/c+d

Tháng Bảy 25, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: cho a/b=c/d
CMR
a/a-c=b/b-d
a/c=a+b/c+d

Comments ( 1 )

  1. ngocbichchau
    ngocbichchau
    25 Tháng Bảy, 2022 at 9:06 sáng
    Reply
    a/b=c/d;a=bk;c=dk
    Ta có:
    a/(a-c)=(bk)/(bk-dk)=(bk)/(k.(b-d))=b/(b-d)
    Mà b/(b-d)=b/(b-d)
    =>a/(a-c)=b/(b-d)
    —-
    (a+b)/(c+d)=(bk+b)/(dk+d)=(b.(k+1))/(d.(k+1))=b/d
    a/c=(bk)/(dk)=b/d
    Mà b/d=b/d
    =>a/c=(a+b)/(c+d)

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

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