直接写出得数。                                                                                                                              

17.4－8＝	5.6＋4＝	23＋4.7＝	10－2.3＝
8.5×4＝	2.3×4×0＝	1000×0.44＝	3.5×0.5＝
0.9－0.63＝	0.34＋0.67＝	0.06×0.7＝	0.05×100＝