bonjour
A = 10 x ( - 3 )² - ( - 5 ) x 10
A = 10 x 9 - ( - 50 )
A = 90 + 50 = 140
140 = 1.4 x 10 ²
A = 10×(-3)²-(-5)×10
A = 10×9+5×10
A = 90+50
A = 140
l'écriture scientifique de A donne : A = 1,4×10²
