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A )5×-10 (2-10)+(2-10-3)(4-7×-10)
B) 2 (4+1/5)(1-3×1/5)-(7×1/5+2)(5-1/5)
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coucou

a) 5*-10(2-10)+(2-10-3)(4-7*-10)
= -50(2-10) -11*74
=-50*-8 - 814
=400 -814
= -414

b) 2(4+1/5)(1-3*1/5)-(7*1/5+2)(5-1/5)
=2(20/5+1/5)(5/5-3/5)-(7/5+10/5)(25/5-1/5)
=2*21/5*2/5-17/5*24/5
=42/5*5/5+7/5
=225/25 +7/5
=9 +7/5
= 45/5 +7/5
= 52/5
= 10,4

voila j espere t avoir aider