2) Simplifier et réduire les expressions suivantes : D =3t+4t+7t-5 E = 21+3+4x2x+3x5x+11x2 F = 25+5a+11+3a-a+5 E G = 5,3+2x5x+3,2-3x2x-1,6 H = 2x3,5xx+9xxxxX 12+1,05x10xx-0,1xXx xxyx2+3x7x2-xxxx5+8xyxx-0,6×4
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D=3t+4t+7t-5
=14t-5
E = 21+3+4x2x+3x5x+11x2
= 23x+46
F = 25+5a+11+3a-a+5
= 7a+41
G = 5,3+2x5x+3,2-3x2x-1,6
=16x+6,9