Explicație pas cu pas:
a)
(143+275)×6=418×6=2508
(143+275)×6=143×6+275×6=858+1650=2508
(874-539)×7=335×7=2345
(874-539)×7= 874×7-539×7=6118-3773=2345
b)
(6872+3829)×4=10701×4=42804
(6872+3829)×4=6272×4+3829×4=25088+15316=42804
(8562-3784)×4=4478×4=19112
(8562-3784)×4=8562×4-3784×4=34248-15136=19112
c)
(14365+24812)×2=39177×2=78354
(14365+24812)×2=14365×2+24812×2=28730+49624=78354
(46312-18316)×3=27996×3=83988
(46312-18316)×3=46312×3-18316×3=138936-54948=83988
