计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50=

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计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50=

计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50=
计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50=

计算1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50=
1+(2+3)-(4+5)+(6+7)-(8+9)······-(48+49)+50
=1+48÷4×(-4)+50
=1-48+50
=3

3