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Calculati , folosind scoaterea unui factor comun:
a) 63 x 52 + 63
b) 57 + 57 x 85
c) 80 x 45+45
d)27 x108-27
e)207 x 35 - 35
f)57x176-57
2) Cerinta la fel
a) 54 x 432 + 54 x 751 - 183 x 54
b)38 x643 - 255 x 38 +38x612
c)47x529 + 616 x 47 - 47 x 145
d)63 x 192 + 908 x 63 -63 x 100


Răspuns :

1.
a) 63 x 52 + 63 = 63 ( 52 + 1 ) = 63 x 53 = 3339
b) 57 + 57 x 85 = 57 ( 1 + 85 ) = 57 x 86 = 4902
c) 80 x 45 + 45 = 45 ( 80 + 1 ) = 45 x 81 = 3645
d) 27 x 108 - 27 = 27 ( 108 - 1 ) = 27 x 107 = 2889
e) 207 x 35 - 35 = 35 ( 207 - 1 ) = 35 x 206 = 7210
2.
a) = 54 ( 432 + 751 - 183 ) = 54 x 1000 = 54000
b  = 38 ( 643 - 255 + 612 ) = 38 x 1000 = 38000
c) = 47 ( 529 + 616 - 145 ) = 47 x 1000 = 47000
d) = 63 ( 192 + 908 - 100 ) = 63 x 1000 = 63000