Bonjour
Réponse:
A=17×200=3417
B=32×98=2254
C=17×15+83×15=1500
D=123×57-25×57+2×57=5700
Explications étape par étape:
D'ou :
A=17×201
=17×(200+1)
=17×200 +17×1
=3400+17
=3417
B=23×98
=23×(100-2)
=2300-46
=2254
C=17×15 +83 ×15
=15×(17+83)
=255+1245
=1500
D=123×57-25×57 +2 ×57
=57×(123-25+2)
=7011-1425+114
=5700