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En utilisant des phrases idiomatiques on peut améliorer son niveau de la langue parce qu'elles sont plus complexes étant donné qu'elles ne traduisent pas littéralement. Donc, telles expressions démontrent...

The demographic transition model is a representation of how a country's population changes over time with development. Stage 1 represents populations at the beginning of this model. It is characterised by...

(3x² - 8x - 3) / 2x² - 6x == (3x + 1)(x - 3) / 2x² - 6x == (3x + 1)(x - 3) / 2x(x-3) == 3x+1 / 2x

(5-x)/2=2x-7 5-x=4x-14 5=5x-14 19=5x x=19/5

a neutron is absorbed by a big nucleusthe nucleus then splits into 2 smaller nucleithis releases energy and more neutrons