求教数学题,递等式计算『列式计算』

600-25×20+30
=600-500+30
=100+30
=130
140+325÷5-58
=140+65-58
=205-58
=147
36x48-987÷47
=1728-21
=1707
75+92÷23x26
=75+4×26
=75+104
=179
960-161x5÷7
=960-805÷7
=960-115
=845
135÷27+2211÷33
=5+67
=72
75x75+3x25x25
=75×75+75×25
=75（75+25）
=75×100
=7500
{100-25}x4
=100×4-25×4
=400-100
=300
632x75+632+632x24
=632（75+1+24）
=632×100
=63200
再问： 999×67 巧算递等式