Sagot :
A = -5/4 x 2/3 + 7/10 : 3/5
A = -10/12 + 7/10 * 5/3
A = -10/12 + 35/30
A = -50/60 + 70/60
A = 20/60
A= 2/6
A = 1/3
B = 7/18 x 2/7 - (5/3 - 1)²
B = 2/18 - 25/9 + 10/3 - 1
B = 2/18 - 50/18 + 60/18 - 18/18
B = -6/18
B = -1/3
A=-5/4x2/3+7/10/2/5
=5/6+7/4
=10/12+21/12
=31/12
B=7/18x2/7-[5/3-1]*2
=1/9-4/9
=-3/9
=1/3