Question

buna ! cine ma poate ajuta si pe mine cu ex 0,12×0,4+45×0,9+4​

Answer 1

$0,12 \cdot 0,4 + 45 \cdot 0,9 + 4 = \dfrac{12}{100} \cdot \dfrac{4}{10} + 45 \cdot \dfrac{9}{10} + 4 = \dfrac{48}{1000} + \dfrac{405}{10} + 4 = \dfrac{48}{1000} + \dfrac{40500}{1000} + \dfrac{4000}{1000} = \dfrac{48+40500+4000}{1000} = \dfrac{44548}{1000} = \bf 44\dfrac{137}{250}$

sau:

$0,12 \cdot 0,4 + 45 \cdot 0,9 + 4 = 0,048+40,5+4 = \bf 44,548$