1-2+3-4+5-6+```+87-88=?
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1-2+3-4+5-6+```+87-88=?
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![1-2+3-4+5-6+```+87-88=?](/uploads/image/z/18544274-26-4.jpg?t=1-2%2B3-4%2B5-6%2B%60%60%60%2B87-88%3D%3F)
1+2+3-4+5+6+7-8+.+85+86+87-88
=1+2+3+4+5+6+7+8+...+85+86+87+88-4*2-8*2-12*2-...-88*2
=(1+88)*88/2-8*1-8*2-8*3-...-8*22
=44*89-8*(1+2+3+...+22)
=44*89-8*(1+22)*22/2
=44*89-8*11*23
=44*89-44*46
=44*(89-46)
=44*43
=1892.
=1+2+3+4+5+6+7+8+...+85+86+87+88-4*2-8*2-12*2-...-88*2
=(1+88)*88/2-8*1-8*2-8*3-...-8*22
=44*89-8*(1+2+3+...+22)
=44*89-8*(1+22)*22/2
=44*89-8*11*23
=44*89-44*46
=44*(89-46)
=44*43
=1892.
计算:1-2+3-4+5-6+…+87-88=______.
1+2+3+4+5+6+7+8+9.+81+82+83+84+85+86+87+88+89+90.
1+2+3+.+86+87+88=简算!
1+1+2+2+3+4+5+5+7+9++56+8+6+++88+9=?
1+2-3+4+5-6+7+8—9+...+88+89—90=( )
简算:1+2+3+4+5+6+7+8+7+6+5+4+3+2+1/88*88
解方程 x:5分之2=16 50%x-40=96/2分之1 灵活计算 88分之87*89 12*(4分之5-6分之5)/
六年级下册数学书87页做一做、88页2、3、4、5题
1+2+5+6-3-9+6-5+8-2-44+88-24-56=?
1+2+3+4+5+6+7+8+9+10+11+22+33+44+55+66+77+88+99=?
int a[ ]={1,2,3,4,5,6,7,88,9,10},*p=a; 则值为3的表式是( ) A) p+=2,*
99+1+88+2+77+3+66+4+55+5+44+6