1除以[(-2)的2次方×0.5的2次方-(-2.24)除以(-2)的3次方]-1又18分之7
问题描述:
1除以[(-2)的2次方×0.5的2次方-(-2.24)除以(-2)的3次方]-1又18分之7
答
1÷[(-2)²×0.5²-(-2.24)÷(-2)³]-1又7/18
=1÷[4×0.25-(-2.24)÷(-8)]-25/18
=1÷[1-0.28]-25/18
=1÷0.72-25/18
=1÷18/25-25/18
=1×25/18-25/18
=25/18-25/18
=1