Question

3.65×21+26.5×4.5+0.365+340怎么简便计算？

Answer 1

原式＝3.65×21+3.65×34+26.5×4.5
＝3.65×（21+34）+26.5×4.5
＝3.65×55+26.5×4.5
＝36.5×5.5+26.5×4.5
＝10×5.5+26.5×5.5+26.5×4.5
＝55+26.5×（5.5+4.5）
＝55+26.5×10
＝55+265
＝320

Answer 2

＝3.65×21+3.65×34+26.5×4.5
＝3.65×（21+34）+4.5×26.5
＝36.5×5.5+（5.5-1）×26.5
＝5.5×36.5+5.5×26.5-26.5
＝5.5×（36.5-26.5）-26.5
＝5.5×10-26.5
＝55-26.5
＝28.5

Answer 3

3.65x21+26.5ⅹ4.5+0.365+340
=3.65ⅹ(21+0.1)+26.5x4.5+340
=3.65x21.1+26.5ⅹ4.5+340
=77.015+119.25+340
=536.355

Answer 4

=3.65×21+3.65×34+26.5×4.5
=3.65×(21+34)+26.5×4.5
=3.65×55+2.65×45
=(1+2.65)×55+2.65×45
=55+2.65×(55+45)
=55+265
=320