你好,拭一个共有的可简化原式的设为A,所以设 10.1-1.009=A,则原式化为,
(10.1-1.009-2)×0.49+0.51×(10.1-1.009+1)
=(A-2)×0.49+0.51×(A+1)
=(A-2)×0.49+0.51×(A-2+3)
=(A-2)×0.49+0.51×(A-2)+0.51x3
=(A-2)×(0.49+0.51)+1.53
=A-2+1.53
=10.1-1.009-2+1.53
=10.1-1.009-0.47
=10.1-1.479
=10.1-1.5+0.021
=8.6+0.021
=8.621
若满意请采纳 ,