用简便运算算28*[(93—304)/42]
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/27 06:02:42
![用简便运算算28*[(93—304)/42]](/uploads/image/z/144122-50-2.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%E7%AE%9728%2A%5B%2893%E2%80%94304%29%2F42%5D)
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用简便运算算28*[(93—304)/42]
用简便运算算28*[(93—304)/42]
用简便运算算28*[(93—304)/42]
28×[(93-304)÷42]
=(93-304)(28÷42)
=(93-100-204)*2/3
=(-7-204)*2/3
=(-210-1)*2/3
= -(210*2/3+2/3)
=-140又2/3
28×[(93-304)÷42]
= 28×(93-304)÷42
=(93-304)(28÷42)
=(93-303-1)×2/3
=62-202-2/3
=-140又2/3
把28和42同时除以14,得分子是2*(-211),分母是3,结果就是-422/3。
解毕!