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AMNEWID

AMNEWID. Datrys Hafaliadau o fformiwlau Amnewid. Amnewid. Os yw a = 2 b = 3 c = 5. 2. 2. 2. 3. 3. 5. 5. Beth yw gwerth…?. =10. +. +. a + b + c =. 2. 4a =. 4. x. =8. 4 x a =. 3. 2bc =. 2. x. x. 2 x b x c =. =30. Ymarfer. Os yw a = 4 b = 2 c = 1.

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AMNEWID

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  1. AMNEWID Datrys Hafaliadau o fformiwlau Amnewid

  2. Amnewid Os yw a = 2 b = 3c = 5 2 2 2 3 3 5 5 Beth yw gwerth…? =10 + + • a + b + c = 2. 4a = 4 x =8 4 x a = 3. 2bc = 2 x x 2 x b x c = =30

  3. Ymarfer Os yw a = 4 b = 2c = 1 Beth yw gwerth…? 6. abc 7. 5ab 8. 2b + 3ac 9. a2 10. 10b3 • a + b + c • 3a • 2b + a • 5a + 9c • 10c – 2b

  4. h l l h Datrys hafaliadau o fformiwlau Mae’r fformiwla P = 2l + 2h yn rhoi perimedr y petryal hwn. Darganfyddwch P pan fo … a) l = 3 a h = 5 b) l = 6 a h = 20 P = 2l + 2h P = 2l + 2h P = (2 x l) + (2 x h) P = (2 x l) + (2 x h) P = (2 x ) + (2 x ) 3 5 P = (2 x ) + (2 x ) 6 20 P = 6 + 10 = 16 = 52 P = 12 + 40

  5. Datrys hafaliadau o fformiwlau 1. Gallwn ddefnyddio’r fformiwla ganlynol i ddarganfod cyflog Dewi. C =£ 6h + 12 Darganfyddwch y cyflog c, o wybod fod nifer yr oriau a weithiwyd h, yn 30. C = £6h + 12 C = £6 x h + 12 h= 30 C = £6 x + 12 30 = £192 C = £180 + 12

  6. B = Datrys hafaliadau o fformiwlau 2. Gallwn ddefnyddio’r fformiwla ganlynol i ddarganfod buanedd car. B =p a Darganfyddwch y buanedd b, o wybod fod y pellter p, yn 200 milltir a’r amser a, yn 3 awr B =p a p= 200 a= 3 200 = 66.7 m.y.a 3

  7. Datrys hafaliadau o fformiwlau 3. Darganfyddwch werth t gan ddefnyddio’r fformiwla t = pr + s2 Pan fo p = 10, r = - 2 a s = 6 - 2 10 6 6 t = pr + s2 t = p x r + s x s t = x + x t = -20 + 36 = 16

  8. Ymarfer 1. Gallwn ddefnyddio’r fformiwla ganlynol i ddarganfod arwynebedd petryal. a = hl Darganfyddwch yr arwynebedd a, o wybod fod yr hyd h yn 7cm a’r lled l yn 6cm. 2. Gallwn ddefnyddio’r fformiwla ganlynol i ddarganfod cost llogi beic. C = 4 + 2a Darganfyddwch y gost C, o wybod fod nifer yr oriau a yn 7.

  9. Ymarfer 3. Darganfyddwch werth c gan ddefnyddio’r fformiwla c = 5a - b2 Pan fo a = 8 a b = 4 4. Darganfyddwch werth f gan ddefnyddio’r fformiwla f = 6d2 de Pan fo d = 2 a e = -3

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