Предмет: Математика, автор: svetikk8585

вычисли удобным способом: 7+8+3+2 6+2+8+4 18+11+2+9 17+5+5+3

Ответы

Автор ответа: к5о5т5я

7+8+3+2=(7+3)+(8+2)=20

6+2+8+4=(6+4)+(2+8)= 20

18+11+2+9=(18+2)+(11+9)=40

17+5+5+3=(17+3)+(5+5)=30

Автор ответа: Anna216

7+8+3+2 =(7+3)+(8+2)=10+10=20

6+2+8+4=(6+4)+(8+2)=10+10=20

18+11+2+9=(18+2)+(11+9)=20+20=40

17+5+5+3=(17+3)+(5+5)=20+10=30

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