Question

3.45X0.6X2.8递等式（简便计算）？

Answer 1

解析：依题意可得，

3.45X0.6X2.8

=2.07x2.8

=2x2.8+0.07x2.8

=5.6+0.196

=5.796

Answer 2

3.45x0.6x2.8
=1.15x3x2x0.3x0.7x4
=1.15x2x4x3x0.3x0.7
=1.15x2x4x0.9x0.7
=2.3x4x0.9x0.7
=9.2x0.63
＝(10-0.8)x0.63
＝6.3-0.63x0.8
=6.3-0.504
=5.796

Answer 3

递等式计算
3.45X0.6X2.8
=2.07x2.8
=2x2.8+0.07x2.8
=5.6+0.196
=5.796

Answer 4

解：3.45X0.6X2.8
=2.07x2.8
=2x2.8+0.07x2.8
=5.6+0.196
=5.796

Answer 5

依据题意列式计算如下：
3.45×0.6×2.8
＝3.45×2×（0.3×2.8）
＝6.9×0.84
＝7×0.84-0.1×0.84
＝5.88-0.084
=5.796
利用乘法结合律进行简便计算