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Răspuns :

2.a)

100x(64+1689)=100x1753=175300

100x(64+1689)=100x64+100x1689=6400+168900=175300

b)

200x(452-124)=200x328=328x2x100=656x100=65600

200x(452-124)=200x452-200x124=452x2x100-124x2x100=

=904x100-248x100=90400-24800=65600

3) a) (420x5-31)-20x25=(2100-31)-500=2069-500=1569

b) [(200x5+18)-15x2:10]+4x120=(1000+18-30:10)+480=1018-3+480=1015+480=

=1495