答对给50!39×89—801简算?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 11:01:07
![答对给50!39×89—801简算?](/uploads/image/z/1240021-37-1.jpg?t=%E7%AD%94%E5%AF%B9%E7%BB%9950%2139%C3%9789%E2%80%94801%E7%AE%80%E7%AE%97%3F)
x){v;ijhlyx壆)5<_7&H;LBؾabk~O'HF.nb ZX@xFf6yvP79@嶖VuA1 bH4 k
答对给50!39×89—801简算?
答对给50!39×89—801简算?
答对给50!39×89—801简算?
39×89—801
=(40-1)×89-801
=40×89-1×89-801
=3560-890
=2670
801=9X89
39×89—801=39X89-9X89=(39-9)X89=30X89=2670