简算简算,全是简算急,快!1.25*0.25*61*168.4*98+8.4+8.42.4*1.023.5除以21要有过程，谢谢谢

Question

简算 简算,全是简算 急,快!
1.25*0.25*61*16
8.4*98+8.4+8.4
2.4*1.02
3.5除以21
要有过程，谢谢谢

Answer 1

1.25*0.25*61*16
=(0.25*4)*(1.25*4)*61
=1*5*61
=305
4*98+8.4+8.4
=4*98+8.4*1+8.4*1
=4*(98+1+1)
=4*100
=400
4*1.02
=4*1+4*0.02
=4+0.08
=4.08
3.5/21
=(3.5*2)/(21*2)
=7/42
=1/6