19.食堂里有500千克面粉,每天做馒头要面粉15千克.食堂里的面粉最多够用( )天.
| A. | 31 | B. | 32 | C. | 33 |
12.与102-100+45运算顺序不相同的是( )
0 129612 129620 129626 129630 129636 129638 129642 129648 129650 129656 129662 129666 129668 129672 129678 129680 129686 129690 129692 129696 129698 129702 129704 129706 129707 129708 129710 129711 129712 129714 129716 129720 129722 129726 129728 129732 129738 129740 129746 129750 129752 129756 129762 129768 129770 129776 129780 129782 129788 129792 129798 129806 199269
| A. | 102+100-45 | B. | 102×100÷45 | C. | 102-100×45 |