Sagot :
A=2x2/3x3 + (7x2/9x2 - 6/18)
= 4/9+ (14/18-6/18)
=4x2/9x2 + 8/18
=8/18+8/18
=16/18=8/9
B= 2x7/3x4 - 5/8 x 7/4
=14/12 - 5x7/8x4
=14/12 - 35/32
=14x8/12/8 - 35x3/32x3
=112/96 - 105/96
=7/96
= 4/9+ (14/18-6/18)
=4x2/9x2 + 8/18
=8/18+8/18
=16/18=8/9
B= 2x7/3x4 - 5/8 x 7/4
=14/12 - 5x7/8x4
=14/12 - 35/32
=14x8/12/8 - 35x3/32x3
=112/96 - 105/96
=7/96
Réponse :
Explications étape par étape
A = (2/3)² + ( 7/9 - 6 /18 )
⇔ A = 4/9 + 7/9 - 3/9
⇔ A = 8/9
B = 2/3 * 7/4 - 5/8 + 4/7 en premier la multiplication
⇔ B = 1/3 * 7/2 - 5/8 : 4/7
⇔ B = 7/6 - 5/8 * 7/4
⇔ B = 7/6 - 35/32
⇔ B = ( 7 * 16 - 35 * 3 ) / 96
⇔ B = ( 112 - 105 ) / 96
⇔ B = 7 / 96