括号125×12括号再乘以86的简便算法

括号125×12括号再乘以86的简便算法
2024-11-25 14:34:57
推荐回答(3个)
回答1:

原式=125X12X86=125X4X3X2X43=125X4X2X3X43=1000X3X43=129000

回答2:

(125*12)*86
=125*12*86
=125*4*3*2*43
=(125*4*2)*3*43
=1000*129
=129000
考察:125*8=1000

回答3:

(125*12)*86
=125*4*3*86
=500*3*86
=1500*86
=1500*(90-4)
=1500*90-1500*4
=135000-6000
=129000