bonsoir
aire rectangle = ( 2 x + 5 ) ( 4 x - 7 )
= 8 x² - 14 x + 20 x - 35
= 8 x² + 6 x - 35
aire triangle =( ( 2 x - 4 ) ( 3 x - 5 ) ) / 2
= ( 6 x² - 10 x - 12 x + 20 ) / 2
= 6 x² - 22 x + 20 / 2
= 3 x² - 11 x + 10
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bonsoir
aire rectangle = ( 2 x + 5 ) ( 4 x - 7 )
= 8 x² - 14 x + 20 x - 35
= 8 x² + 6 x - 35
aire triangle =( ( 2 x - 4 ) ( 3 x - 5 ) ) / 2
= ( 6 x² - 10 x - 12 x + 20 ) / 2
= 6 x² - 22 x + 20 / 2
= 3 x² - 11 x + 10