问题描述:
王永把△×0.8+0.4误算成△×(0.8+0.4),他得的结果比正确得数大5.6,正确结果是多少?最佳答案:
因为△×(0.8+0.4)-(△×0.8+0.4)
=△×0.8+△×0.4-△×0.8-0.4
=△×0.4-0.4
=5.6
所以△=(5.6+0.4)÷0.4
=6÷0.4
=15
所以△×0.8+0.4
=15×0.8+0.4
=12+0.4
=12.4
答:正确结果是12.4.
王永把△×0.8+0.4误算成△×(0.8+0.4),他得的结果比正确得数大5.6,正确结果是多少?
问题描述:
王永把△×0.8+0.4误算成△×(0.8+0.4),他得的结果比正确得数大5.6,正确结果是多少?因为△×(0.8+0.4)-(△×0.8+0.4)
=△×0.8+△×0.4-△×0.8-0.4
=△×0.4-0.4
=5.6
所以△=(5.6+0.4)÷0.4
=6÷0.4
=15
所以△×0.8+0.4
=15×0.8+0.4
=12+0.4
=12.4
答:正确结果是12.4.