5.直接写出得数:
46+64= | 215-125= | 50×40= |
70+120= | 116-58=58 | $\frac{5}{9}-\frac{2}{9}$= |
$\frac{23}{25}-\frac{8}{25}$= | $\frac{6}{13}+$$\frac{7}{13}$=1 | 509×23≈ |
1.脱式计算.
2089-125×8 | (14+16)×150 | 108÷(58-49) |
38×18÷9 | 47×62-627 | 475-408÷6 |
16×(18+27) | 32×(325-298) | 125÷5×25 |
20.直接写出得数.
0 162474 162482 162488 162492 162498 162500 162504 162510 162512 162518 162524 162528 162530 162534 162540 162542 162548 162552 162554 162558 162560 162564 162566 162568 162569 162570 162572 162573 162574 162576 162578 162582 162584 162588 162590 162594 162600 162602 162608 162612 162614 162618 162624 162630 162632 162638 162642 162644 162650 162654 162660 162668 199269
70×3= | 36×20= | 60×30= | 98×100= |
50×22= | 80×90= | 12×70= | 30×40= |
300÷4= | 40×40= | 91×50= | 22×30= |
200×40= | 50×60= | 20×80= | 11×70= |
80×20= | 40×90= |