计算,怎样算简便就怎样算
102×(4.5÷0.09) | 19.96×5.4-4.4×19.96 | 3.8+2.49+7.51+4.2 |
2.3+3.91÷(22-19.7) | (1-0.2)×[13-(3.12+5.28)] | 9.9×1.45. |
用竖式计算下面各题,并且验算.
(1)30.98+5.12 | (2)12-7.64. |
解下列方程.
x-55%=18 | 13%x-19=17 | (2.5+240%)x=14.7. |
102×(4.5÷0.09) | 19.96×5.4-4.4×19.96 | 3.8+2.49+7.51+4.2 |
2.3+3.91÷(22-19.7) | (1-0.2)×[13-(3.12+5.28)] | 9.9×1.45. |
(1)30.98+5.12 | (2)12-7.64. |
x-55%=18 | 13%x-19=17 | (2.5+240%)x=14.7. |