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几道数学题(要有过程)1.-13*2/3-0.34*2/7+1/3*(-13)-5/7*0.342.(-13/4+7/8-7/12)*(-11/7)3.(1-1/2)(1/3-1)(1-1/4)(1/5-1)...(1-1/2004)(1/2005-1)4.(-5/2
题目详情
几道数学题 (要有过程)
1. -13 * 2/3 - 0.34 * 2/7 + 1/3* (-13) -5/7*0.34 2.(-1 3/4 + 7/8 -7/12)*(-1 1/7) 3.(1- 1/2)(1/3-1)(1-1/4)(1/5-1)...(1- 1/2004)(1/2005-1) 4.(-5/24)*8/15*(-3/2)*1/4
1. -13 * 2/3 - 0.34 * 2/7 + 1/3* (-13) -5/7*0.34 2.(-1 3/4 + 7/8 -7/12)*(-1 1/7) 3.(1- 1/2)(1/3-1)(1-1/4)(1/5-1)...(1- 1/2004)(1/2005-1) 4.(-5/24)*8/15*(-3/2)*1/4
▼优质解答
答案和解析
1、 -13 * 2/3 - 0.34 * 2/7 + 1/3* (-13) -5/7*0.34
=-13(2/3+1/3)-0.34(2/7+5/7)
=-13-0.34=-13.34
2、(-1 3/4 + 7/8 -7/12)*(-1 1/7)
=(-78/24+21/24-14/24)(-11/7)
=71/24*11/7
3、(1- 1/2)(1/3-1)(1-1/4)(1/5-1)...(1- 1/2004)(1/2005-1)
=1/2*2/3*3/4*4/5.2003/2004*2004/2005
=1/2005
4、(-5/24)*8/15*(-3/2)*1/4
=5/24*8/15*3/2*1/4
=15/48*8/15*1/4
=1/24
=-13(2/3+1/3)-0.34(2/7+5/7)
=-13-0.34=-13.34
2、(-1 3/4 + 7/8 -7/12)*(-1 1/7)
=(-78/24+21/24-14/24)(-11/7)
=71/24*11/7
3、(1- 1/2)(1/3-1)(1-1/4)(1/5-1)...(1- 1/2004)(1/2005-1)
=1/2*2/3*3/4*4/5.2003/2004*2004/2005
=1/2005
4、(-5/24)*8/15*(-3/2)*1/4
=5/24*8/15*3/2*1/4
=15/48*8/15*1/4
=1/24
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