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1.0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2.-36×-4/9+5/6-7/12 3.99 7/8×-13 4.-17×-3 1/170.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2.-36×-4/9+5/6-7/12 3.99 7/8×-13 4.-17×-3 1/17

分类: 作业答案 • 2021-12-20 01:34:03
问题描述：

1.0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2.-36×-4/9+5/6-7/12 3.99 7/8×-13 4.-17×-3 1/17
0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14
2.-36×-4/9+5/6-7/12
3.99 7/8×-13
4.-17×-3 1/17

答

1.0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14
=0.7x85/9-11/4x14+0.7x5/9-1/4x14
=0.7x(85/9+5/9)-1/4x(11/4+1/4)
=0.7x10-1/4x3
=7-3/4
=6.25
2.-36×-4/9+5/6-7/12
=16+10/12-7/12
=-16+1/4
=-15.75
3.99 7/8×-13
=(100-1/8)x-13
=-1300+13/8
=-1298又3/8
4.-17×-3 1/17
=17x52/17
=52

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