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ex1
A= 3/5 + 3x + x - 1/10 -5x/3 -4/7
A= 4x -5x/3 + 3/5 -1/10 -4/7
A= 7x/3 -1/14
B= x/30 -1/72 -1/3 -x/30 +1/72
B= -1/3
C= 3-2/7 +2t + 3(2t-t+4+ 2/21)
C= 19/7 +2t + 6t -3t +12 + 6/21
C= 5t +15
ex2
1) T=(5x+2)(4-7x+5x-2)
T=(5x+2)(-2x+2)
2) T= (5x+2)(-2x+2) = -10x² +10x -4x+4 = -10x² +6x +4
3) T(-2/5) = -10* (-2/5)² + 6* -2/5 + 4 = 0
T(4/3) = -10 * (4/3)² + 6* 4/3 + 4 = -52/9
ex 3
1) A= (x+1)(2x-1)-2x²
A= 2x² -x +2x -1 -2x²
A= x -1
2) A= 100 001 * 199 999 -2* 100 000²
A = (100 000 +1)* (200 000 -1) -2*100 000²
A = 20 000 000 000 - 100 000 + 200 000 -1 -2* 10 000 000 000
A= 99 999
voila j espere t avoir aider