Question

реши удобным способом

Answer 1

1) (38+2)+(45+5)=40+50=90
2) (27+3) + (14+6)=30+20=50
3) (17+3) + (34+6)=20+40=60
4) (25+5) + (42+8)=30+50=80

Answer 2

45+38+5+2=(45+5)+(38+2)=50+40=90
6+27+14+3=(6+14)+(3+27)=20+30=50
17+6+34+3=(17+3)+(6+34)=20+40=60
25+8+5+42=(25+5)+(42+8)=30+50=80