Răspuns :
a)1,2+2,3+3,4+4+5,6+6,7+7,8=31
b)1,23+2,34+3,45+5,55+6,66+7,77=27
b)1,23+2,34+3,45+5,55+6,66+7,77=27
a) 1,2+2,3+3,4+4+5,6+6,7+7,8 =
= 1,2+7,8 + 2,3+6,7 + 3,4 +5,6 + 4 =
= 9 + 9 + 9 + 4 =
= 27 + 4
= 31
b) 1,23+2,34+3,45+5,55+6,66+7,77 =
= 1,23+7,77 + 2,34+6,66 + 3,45+5,55 =
= 9 + 9 + 9 =
= 27
La fiecare exercitiu am grupat termenii convenabil.
= 1,2+7,8 + 2,3+6,7 + 3,4 +5,6 + 4 =
= 9 + 9 + 9 + 4 =
= 27 + 4
= 31
b) 1,23+2,34+3,45+5,55+6,66+7,77 =
= 1,23+7,77 + 2,34+6,66 + 3,45+5,55 =
= 9 + 9 + 9 =
= 27
La fiecare exercitiu am grupat termenii convenabil.