数学题快(-8)+10+2+(-1)(-6)+3+9+(-4)+(-7)用简便运算(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.51 1+(-1/2)+1/3+(-1/6) 1/2+(-2/3)+4/5+(-1/2)-(+1/3)1全部都要用简便计算 1 (-8)+10+2+(-1) 2.(-6)+3+9+(-4
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/07 01:28:01
![数学题快(-8)+10+2+(-1)(-6)+3+9+(-4)+(-7)用简便运算(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.51 1+(-1/2)+1/3+(-1/6) 1/2+(-2/3)+4/5+(-1/2)-(+1/3)1全部都要用简便计算 1 (-8)+10+2+(-1) 2.(-6)+3+9+(-4](/uploads/image/z/243428-68-8.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%E5%BF%AB%EF%BC%88-8%EF%BC%89%2B10%2B2%2B%EF%BC%88-1%EF%BC%89%EF%BC%88-6%EF%BC%89%2B3%2B9%2B%EF%BC%88-4%EF%BC%89%2B%EF%BC%88-7%EF%BC%89%E7%94%A8%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%EF%BC%88-0.8%EF%BC%89%2B1.2%2B%EF%BC%88-0.7%EF%BC%89%2B%EF%BC%88-2.1%EF%BC%89%2B0.8%2B3.51+1%2B%EF%BC%88-1%2F2%29%2B1%2F3%2B%28-1%2F6%29+1%2F2%2B%28-2%2F3%29%2B4%2F5%2B%28-1%2F2%29-%28%2B1%2F3%291%E5%85%A8%E9%83%A8%E9%83%BD%E8%A6%81%E7%94%A8%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97+1+%EF%BC%88-8%EF%BC%89%2B10%2B2%2B%EF%BC%88-1%EF%BC%89+2.%EF%BC%88-6%EF%BC%89%2B3%2B9%2B%EF%BC%88-4)
数学题快(-8)+10+2+(-1)(-6)+3+9+(-4)+(-7)用简便运算(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.51 1+(-1/2)+1/3+(-1/6) 1/2+(-2/3)+4/5+(-1/2)-(+1/3)1全部都要用简便计算 1 (-8)+10+2+(-1) 2.(-6)+3+9+(-4
数学题快(-8)+10+2+(-1)(-6)+3+9+(-4)+(-7)用简便运算
(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.51 1+(-1/2)+1/3+(-1/6) 1/2+(-2/3)+4/5+(-1/2)-(+1/3)
1
全部都要用简便计算
1 (-8)+10+2+(-1) 2.(-6)+3+9+(-4)+(-7) 3.(-0.8)+1.2+(-0.7)+(-2.1) 1+ 1/2+1/3+(-1/6) 5.1/2+(-2/3)+4/5+(-1/2)+(-1/3)
数学题快(-8)+10+2+(-1)(-6)+3+9+(-4)+(-7)用简便运算(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.51 1+(-1/2)+1/3+(-1/6) 1/2+(-2/3)+4/5+(-1/2)-(+1/3)1全部都要用简便计算 1 (-8)+10+2+(-1) 2.(-6)+3+9+(-4
(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.51
=1.2+3.51-2.8
=4.71-2.8
=1.81
1+(-1/2)+1/3+(-1/6)
=1/2+1/6
=2/3
1/2+(-2/3)+4/5+(-1/2)-(+1/3)
=4/5-1/3
=7/15
(-8)+10+2+(-1)
=12-9
=3
(-6)+3+9+(-4)+(-7)
=12-17
=-5
(-0.8)+1.2+(-0.7)+(-2.1)
=1.2-3.6
=-2.4
1+ 1/2+1/3+(-1/6)
=1+5/6-1/6
=5/3
1/2+(-2/3)+4/5+(-1/2)+(-1/3)
=1/2+(-1/2)+(-2/3)+(-1/3)+4/5
=-1/5
上面一题还是下面一题啊
0
原式=(2-1)+(4-3)+(6-5)+……+(2008-2007)
=1+1+1+……+1 (共有2008/2=1004个1)
=1004