Question

find value of : 134^3 +123^3 +257^3... (use identity)

Answer 1

Answer:

Step-by-step explanation:

a3 + b3 + c3 = (a+b+c)3 - 3ab(a+b) -3bc(b+c) -3ac(a+c) - 6abc

                   =(134+123+257)³-3(134)(123)(134+123)-3(123)(257)                                   (123+257)-3(134)(257)(134+257)-6(134)(123)(257)

                   =(514)³-7763022-26553240-40392774-25415244

                   =135796744-100124280

                   =35672464

I never done such calculations in my life !!!