灵活计算.
×+× | ×0.375+÷ | (-)×54 | 12.5×0.32×25. |
解方程.
x-25%x=36 | 2x+120%×5=16 | x+x= | (1-45%)x=16.5. |
列竖式计算并验算.
846+395=验算: | 507-96=验算: | 404-186=验算: | 755+165=验算: |
58÷8= | 59÷6= | 68÷7= | 64÷9= |
直接写出得数.
479+321= | 4-0.78= | 8÷0.01= | 8×37.5%= | (+)×12= |
÷(+)= | 1-×= | 1.25×0.16×8= | ×÷×= | ×4+4×= |
求未知数X.
(1)= | (2):=:x | (3)40:x=2.5:15. |