先算35+1+64。乘68再算100×68,最后的答案就是6800
35×68+68+68×64=68×35+68×1+68×64=68×(35+1+64)=68×100=6800
35x68+68+68x64=68x(35+1+64)=68x100=6800
35x68+68+68x64=68x(35+l+64)=68x100=6800