Question

Tính hợp lý : -39(5-99)+99(10-39)

Answer 1

-39(5-99)+99(10-39)

= (-39).5-(-39).99-99.10+99.39

= [(-39.99)-(-99.39)]+(-39.5-99.10)

= 0+(-195-990)

= 0+(-1185)

= -1185

Answer 2

-39(5-99)+99(10-39)

= (-39).5-(-39).99-99.10+99.39

= [(-39.99)-(-99.39)]+(-39.5-99.10)

= 0+(-195-990)

= 0+(-1185)

= -1185

Answer 3

-39(5-99)+99(10-39)

=-39.5+39.99+99.10-99.39

=-39.5+39.99+99.2.5-99.39

=-39.5+39.99+(99.2).5-99.39

=-39.5+39.99+198.5-99.39

=(198.5-39.5)+(39.99-99.39)

=(198-39).5+0

=159.5

=195

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Answer 4

-39(5-99)+99(10-39)

=-39.5+39.99+99.10-99.39

=-39.5+39.99+99.2.5-99.39

=-39.5+39.99+(99.2).5-99.39

=-39.5+39.99+198.5-99.39

=(198.5-39.5)+(39.99-99.39)

=(198-39).5+0

=159.5

=795

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