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Sagot :

A/ 4X +20 -13 = 4X+7
A= 4(x+5)-13
4x+20-13
=4x+7
B=3(x+1)+x+4
3x+3+x+4
3x+x+3+4
=4x+7
C=2(x+3,5)+2x
2x+7+2x
2x+2x+7
=4x+7
D=2(x+4)+2(x-0,5)
2x+8+2x-1
2x+2x+8-1
=4x+7

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