aide moi c'est pour mardi

Il faut commencer par les multiplications

1) A=5/3-8/3X5/2
=5/3-40/6
=10/6-40/6
=-30/6
=-5

2)B=(40/30+9/30):(25/10-4/10)
=(49/30):(11/10)
=(49/30)x(10/11)
=490/330
=49/33

3)C=180X10^-4/1500000
=0,018/1500000
=1,2x10^-8

4)D=(5x-1)²+(x-7)(5x-1)
=(5x-1)((5x-1)-(x-7)
=(5x-1)(5x-1-x+7)
=(5x-1)(4x+6)

5)E=(x+4)(x-4)-(3x+1)²
=x²-4x+4x-16-(9x²+6x+1)
=X²-16-9x²-6x-1
=-8x²-6x-17

6)(2x+8)+5(x-1)=0
2x+8+5x-5=0
7x=5-8
7x=-3
x=-3/7

7)(x-1)²-25=0
x²-2x+1-25=0
x²-2x=25-1
x²-2x=24
x(x-2)=24
x=24 ou x=24+2=26