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TGAU MATHEMATEG - cwestiynau RHIFEDD gydag atebion

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TGAU MATHEMATEG Rhifedd Taflen cwestiwn ac ateb (fy nodiadau adolygu)

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1.​ Mae dau frawd gan Bethan, sef Andrew a Dafydd. Mae Andrew 7
blwyddyn yn hŷn (older) na Bethan. Mae Dafydd 3 blwyddyn yn
hŷn nag Andrew. Heddiw, swm oedrannau’r tri ohonyn nhw yw 59
o flynyddoedd. Beth yw oedran Bethan, Andrew a Dafydd heddiw?

Dull: Y can cyntaf yw i roi nhw gyd at yr un oedran. Felly tynnwch i ffwrdd y
17 sef y cyfanswn o flynyddoedd y mae’r brodyr yn hŷn na Bethan.


59 - (7 + 10 )

59 - 17 = 42



42 = 14

3



14 + 10 = 24 (Dafydd )

14 + 7 = 21 (Andrew)

14 = 14 (Bethan)



Dull Algebra (x yn cynrychioli oedran Bethan)



x = 59 - (10+7)

3



x = 42 = 14

3

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  • tgau mathemateg
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  • cwestiwn ac ateb

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