bonjour
cos ACB = 2/6
arcos 2/6 = 70.5°
10/7 - 2 /5 x 3/6
= 10/7 - 6/30
= 10/7 - 1/5
= 50/35 - 7/35
= 43/35
5 x ( 3 x + 2 ) = 15 x² + 10 x
10 x² - 7 x + 9 = 141
10 ( 4 )² - 7 * 4 + 9 = 141
160 - 28 + 9 = 141
141 = 141
4 est solution
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bonjour
cos ACB = 2/6
arcos 2/6 = 70.5°
10/7 - 2 /5 x 3/6
= 10/7 - 6/30
= 10/7 - 1/5
= 50/35 - 7/35
= 43/35
5 x ( 3 x + 2 ) = 15 x² + 10 x
10 x² - 7 x + 9 = 141
10 ( 4 )² - 7 * 4 + 9 = 141
160 - 28 + 9 = 141
141 = 141
4 est solution