bonjour
a -12+1-7-8+3
a. - ( 12 ) + 1 + ( - 7) + ( - 8 ) + 3
a . - 12 + 1 - 7 - 8 + 3
a = - 23
b 10-9-8-7+2-3
b = 10 + ( - 9) + ( - 8 ) + ( - 7 ) + 2 + ( - 3 )
= 10 - 9 - 8 - 7 + 2 - 3
= 12 - 27
= - 15
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bonjour
a -12+1-7-8+3
a. - ( 12 ) + 1 + ( - 7) + ( - 8 ) + 3
a . - 12 + 1 - 7 - 8 + 3
a = - 23
b 10-9-8-7+2-3
b = 10 + ( - 9) + ( - 8 ) + ( - 7 ) + 2 + ( - 3 )
= 10 - 9 - 8 - 7 + 2 - 3
= 12 - 27
= - 15