4．直接写出得数．
| 5.1-2= | 3.86×1= | 13.4-8= |
| 5.6+3.4= | 10-2.3= | 7.5×4= |
| 2.3×4×0= | 16÷3.2= | 3.5÷0.5= |
3．下列算式中，只有（ ）是方程．
0 157559 157567 157573 157577 157583 157585 157589 157595 157597 157603 157609 157613 157615 157619 157625 157627 157633 157637 157639 157643 157645 157649 157651 157653 157654 157655 157657 157658 157659 157661 157663 157667 157669 157673 157675 157679 157685 157687 157693 157697 157699 157703 157709 157715 157717 157723 157727 157729 157735 157739 157745 157753 199269
| A． | 3x＞8 | B． | 5×7=35 | C． | 2x=5 |