1.笑笑有邮票8枚,比淘气少20%.淘气有多少枚邮票?如果设淘气有x枚邮票,则可以列方程( )
A. | 8(1-20%)=x | B. | (1-20%)x=8 | C. | (1+20%)x=8 |
20.把30%的百分号去掉,这个数( )
A. | 扩大了100倍 | B. | 缩小了100倍 | C. | 大小不变 |
19.增产四成五就是( )
A. | 增产4.5% | B. | 增产45% | C. | 增产450% |
18.0.015=( )
0 158466 158474 158480 158484 158490 158492 158496 158502 158504 158510 158516 158520 158522 158526 158532 158534 158540 158544 158546 158550 158552 158556 158558 158560 158561 158562 158564 158565 158566 158568 158570 158574 158576 158580 158582 158586 158592 158594 158600 158604 158606 158610 158616 158622 158624 158630 158634 158636 158642 158646 158652 158660 199269
A. | 0.15% | B. | 1.5% | C. | 15% |