c= (2x-3)(2x+3)
2x*2x+2x*3-3*2x-3*3
4x²+6x-6x-9
4x²-9
d=(11+8x)²
(8)²x+2*8x*11+11²
64x²+176x+121
e=(x+1)²+7x(2-x)
x²+2*x*1+1²+7x*2+7x*(-x)
x²+2x+1+14x-7x²
-6x²+16x+1
f=(x+3)(2x-1)-3x(2x+5)
x*2x+x*(-1)+3*2x+3*(-1)-3x*2x-3x*5
2x²-x+6x-3-6x²-15x
-4x²-10x-3
g= (4t+1)(4t-1)-(3t+2)²
4t*4t+4t*(-1)+1*4t+1*(-1)-(3)²t+2*(-3t)*2+2²
16t²-4t+4t-1-9t²-12t-4
7t²-12t-5
h= 2(s+5)(5-5)+(45+3)²
2*s+2*5*0+45²+2*45*3+3²
0+2025+270+9
2304
i=(3x+4)²-(1-2x)(6+x)
(3)²x+2*3x*4+4²-1*6-1*x+2x*6+2x*x
9x²+24x+16-6-x+12x+2x²
11x²+35x+10
Les * signifie le signe fois
