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Sagot :
Bonsoir,
a) 9/11-4/121
= 9 x 11 / 11 x 11 - 4/121
= 99/121 - 4/121
= 95/121
b)10/24+21/26
= 10 x 26 / 24 x 26 + 21 x 24 / 26 x 24
= 26/624 + 504/624
= 530/624
= 2 x 265 / 2 x 312
= 265/312
c)9-15/2-3/2
= 9 x 2 / 1 x 2 - 15/2 - 3/2
= 18/2 - 18/2
= 0
d)7/18+2/6+5/9
= 7/18 + 2 x 3 / 6 x 3 + 5 x 2 / 9 x 2
= 7/18 + 6/18 + 10/18
= 23/18
e)(1/10+1/30)-(1/5-1/15)
= (1 x 3 / 10 x 3 + 1/30) - (1 x 3 / 5 x 3 - 1/15)
= (3/30 + 1/30) - (3/15 - 1/15)
= 4/30 - 2/15
= 4/30 - 2 x 2 / 15 x 2
= 4/30 - 4/30
= 0
f)11/7+7/49+6/21
= 11/7 + 7 x 1 / 7 x 7 + 3 x 2 / 3 x 7
= 11/7 + 1/7 + 2/7
= 14/7
= 7 x 2 / 7 x 1
= 2
g)8/5-(1/10+2/10)
= 8/5 - 3/10
= 8 x 2 / 5 x 2 - 3/10
= 16/10 - 3/10
= 13/10
a) 9/11-4/121
= 9 x 11 / 11 x 11 - 4/121
= 99/121 - 4/121
= 95/121
b)10/24+21/26
= 10 x 26 / 24 x 26 + 21 x 24 / 26 x 24
= 26/624 + 504/624
= 530/624
= 2 x 265 / 2 x 312
= 265/312
c)9-15/2-3/2
= 9 x 2 / 1 x 2 - 15/2 - 3/2
= 18/2 - 18/2
= 0
d)7/18+2/6+5/9
= 7/18 + 2 x 3 / 6 x 3 + 5 x 2 / 9 x 2
= 7/18 + 6/18 + 10/18
= 23/18
e)(1/10+1/30)-(1/5-1/15)
= (1 x 3 / 10 x 3 + 1/30) - (1 x 3 / 5 x 3 - 1/15)
= (3/30 + 1/30) - (3/15 - 1/15)
= 4/30 - 2/15
= 4/30 - 2 x 2 / 15 x 2
= 4/30 - 4/30
= 0
f)11/7+7/49+6/21
= 11/7 + 7 x 1 / 7 x 7 + 3 x 2 / 3 x 7
= 11/7 + 1/7 + 2/7
= 14/7
= 7 x 2 / 7 x 1
= 2
g)8/5-(1/10+2/10)
= 8/5 - 3/10
= 8 x 2 / 5 x 2 - 3/10
= 16/10 - 3/10
= 13/10
bonsoir
a = 99/121 - 4/121 = 95/121
b = 130/312 + 252/312 = 382/312 = 191/156
c = 18/2 - 15/2 - 3/2 = 0
d = 7/18 + 6/18 + 10/18 = 23/18
e = ( 3/30 + 1/30) - ( 3/15 - 1/15)
e = 4/30 - 2/15 = 4/30 - 4/30 = 0
f = 231/147 + 21/147 + 42/147 = 294/14 = 2
g = 8/5 - 3/10 = 16/10 - 3/10 = 13/10
a = 99/121 - 4/121 = 95/121
b = 130/312 + 252/312 = 382/312 = 191/156
c = 18/2 - 15/2 - 3/2 = 0
d = 7/18 + 6/18 + 10/18 = 23/18
e = ( 3/30 + 1/30) - ( 3/15 - 1/15)
e = 4/30 - 2/15 = 4/30 - 4/30 = 0
f = 231/147 + 21/147 + 42/147 = 294/14 = 2
g = 8/5 - 3/10 = 16/10 - 3/10 = 13/10
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