Question

672-672÷12x7简便计算？

Answer 1

672-672÷12x7
=672(1-7/12)
=12x56x5/12
=56x5
=560/2
=280

Answer 2

原式＝672-672*7/12，提取公因数672，原式＝672*（1-7/12）＝672*5/12=56*5=280