(1988+1986+1984+…+6+4+2)-(1+3+5+…+1983+1985+1987)
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(1988+1986+1984+…+6+4+2)-(1+3+5+…+1983+1985+1987)
![(1988+1986+1984+…+6+4+2)-(1+3+5+…+1983+1985+1987)](/uploads/image/z/2855308-4-8.jpg?t=%EF%BC%881988%2B1986%2B1984%2B%E2%80%A6%2B6%2B4%2B2%EF%BC%89-%EF%BC%881%2B3%2B5%2B%E2%80%A6%2B1983%2B1985%2B1987%EF%BC%89)
(1988+1986+1984+…+6+4+2)-(1+3+5+…+1983+1985+1987),
=(1988-1987)+(1986-1985)+…(4-3)+(2-1),
=1+1+…1+1,
=1×(1988÷2),
=994.
=(1988-1987)+(1986-1985)+…(4-3)+(2-1),
=1+1+…1+1,
=1×(1988÷2),
=994.
(1988+1986+1984+…+6+4+2)-(1+3+5+…+1983+1985+1987)
计算(1988+1986+1984+...+6+4+2)-(1+3+5+...+1983+1985+1987)
简便计算:1988+1987-1986-1985+1984+1983-1982-1981+……+2-1
1+2-3-4+5+6-7-8+……-1983-1984+1985+1986
(2+4+6+...+1986+1988)—(1+3+5+...+1985+1987)用地等式怎么做
1.(2+4+6+.1984+1986+1988)-(1+3+5+.+1985+1987)=?
1+2-3-4+5+6-7-8+9+10……+1985+1986-1987-1988+1989+1990=_______
1+2-3-4+5+6-7-8+9+10-.+1985+1986-1987-1988+1989+1990=( )
六年级数学计算题1+2-3-4+5+6-7-8.-1983-1984+1985+1986
就是这道题1+2-3-4+5+6-7-8+9+10-…+1985+1986-1987-1988+1989+1990=多少
(2+4+6+.+1986+1988)一(1+3+5+.+1985+1987)计算求解
1983+1985+1987……+1999/1984+1986……+2000大神们帮帮忙