问题
解答题
口算.
|
答案
75×2=150, | 24×5=120, | 37×11=407, | 70×50=3500, |
18×5=90, | 280×20=5600, | 42×70=2940, | 17×5=85, |
38+324=362, | 350-40=310, | 4×25=100, | 800÷20=40, |
100×8=800, | 60÷5=12, | 109×28≈3000, | 489×21≈10000. |
口算.
|
75×2=150, | 24×5=120, | 37×11=407, | 70×50=3500, |
18×5=90, | 280×20=5600, | 42×70=2940, | 17×5=85, |
38+324=362, | 350-40=310, | 4×25=100, | 800÷20=40, |
100×8=800, | 60÷5=12, | 109×28≈3000, | 489×21≈10000. |