| 解方程:打*的要检验 (1)3.6-9x=0.9 | (2)13.4+2.5x=18.4 |
| (3)4(0.9-X)=2.2 | (4)1.8(4.7+x)=19.8 |
| (5)(x+1.8)÷8=6.6 | (6)3×1.8-0.6X=5.1 |
| (7)7.7-2x+9.9=0 | (8)x÷12-6=5.5 |
| *(9)2.5x÷5=170÷4 | (10)12x+36-6x=102 |
| (11)2x-8.6-x=5.4 | (12)2(0.9-X)+4=4.3. |
| 把下面各数改写成以“亿”为单位的数 3800000000= | 20600000000= | 51000000000= | 70000000000= |
| 430000000000= | 600000000= | 9000000000= | 100000000000= |