Explications:
1. développer
a) (2x-5)× 2×-5+3×+7)
= (2x-5) x 5x+2)
2)
a) (2x-5) × (2x-5+3×7)
b) x×(5x-7)
3) a) 3x=7+5
= 3x=12
= x=4
b) 5x= -17-2
= x= -19/5
c) 5x - x= 18-2
= 4x= 16
x = 4
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Explications:
1. développer
a) (2x-5)× 2×-5+3×+7)
= (2x-5) x 5x+2)
2)
a) (2x-5) × (2x-5+3×7)
b) x×(5x-7)
3) a) 3x=7+5
= 3x=12
= x=4
b) 5x= -17-2
= x= -19/5
c) 5x - x= 18-2
= 4x= 16
x = 4