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Sagot :

1 - 1.600 = 2 × 2 × 2 × 2 × 2 × 2 × 5 × 5

2 - EF/MN = EA/AM = AF/AN
4/MN = 2/5 = AF/AN
4 x 5 / 2 = 10
MN = 10cm

3 - 6x(3x - 5) + 7x
18x2 - 30x + 7x
18x2 - 23x

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