4.直接写出得数:
(-13)+(-8)= | 19.3-2.7= | $\frac{4}{9}$×(-$\frac{3}{2}$)= |
225+475= | 15+(-22)= | (-14)÷2= |
3.比的前项不变,后项缩小到原来的$\frac{1}{5}$,比值就( )
0 159498 159506 159512 159516 159522 159524 159528 159534 159536 159542 159548 159552 159554 159558 159564 159566 159572 159576 159578 159582 159584 159588 159590 159592 159593 159594 159596 159597 159598 159600 159602 159606 159608 159612 159614 159618 159624 159626 159632 159636 159638 159642 159648 159654 159656 159662 159666 159668 159674 159678 159684 159692 199269
A. | 扩大到原来的5倍 | B. | 缩小到原来的$\frac{1}{5}$ | C. | 不变 |