Question

(99+99+99+99)*4.1简便计算，要写过程

五年级上册的

Answer 1

(99+99+99+99)*4.1
=99*4*4.1
=(100-1)*4*(4+0.1)
=(400-4)*(4+0.1)
=400*4+400*0.1-4*4-4*0.1
=1600+40-16-0.4
=1623.6

Answer 2

=（400-4）×4.1
=400×4.1-4×4.1
=1640-16.4
=1623.6

Answer 3

（99+99+99+99）*4.1
=4*（100-1）*4.1
=（4*100-4*1）*4.1
=4.1*100*4-4.1*4
=1640-16.4
=1623.6

Answer 4

99+99×99+45\r\n=99×(1+99)+45\r\n=99×100+45\r\n=9900+45\r\n=9945

Answer 5

=（100-1）*4*4.1=100*4*4.1-4*4.1=100*4*（4+0.1）-4*（4+0.1）=100*4*4+100*4*0.1-4*4-4*0.1=1600+40-16-0.4=1623.6

Answer 6

(99+99+99+99)*4.1=
4*99*4.1=
1623.6