| 下面各题怎样算简便就怎样算. 0.78×101 3.8+5.6÷7×4 50×0.18×2 5.4×7.2+2.8×5.4. |
| (1)0.78×101, =0.78×(100+1), =0.78×100+0.78×1, =78+0.78, =78.78; (2)3.8+5.6÷7×4, =3.8+0.8×4, =3.8+3.2, =7; (3)50×0.18×2, =50×2×0.18, =100×0.18, =18; (4)5.4×7.2+2.8×5.4, =5.4×(7.2+2.8), =5.4×10, =54. |
关注公众号回复:奥数答案
即可免费获得密码查看答案
