简便运算:
39×36+26.39×83-263.9×1.9
=39×36+26.39×83-26.39×19
=39×36+26.39×(83-19)
=39×36+26.39×64
=
数字没抄错,我专门核对了.就是因为这样才想不出接下来怎么做更方便.难道按照步骤一步步算?