Question

用简便方法计算..急急急

874-696

1.25*25*3.2

就这两题，谢谢，把过程写出来哦。

Answer 1

874-696
=874-(700-4)
=874-700+4
=174+4
=178

1.25*25*3.2
=1.25*25*(8*0.4)
=(1.25*8)*(25*0.4)
=10*10
=100

Answer 2

874-696
=874-(700-4)
=874-700+4
=174+4
=178

1.25*25*3.2
=1.25*25*4*0.8
=1.25*100*0.8
=1.25*0.8*100
=1*100
=100

Answer 3

874-696

=(880-6)-(700-4）

=880-6-700+4

=178

1.25*25*3.2

=1.23×25×0.8×4

=（1.25×0.8）×（25×4）

=100

Answer 4

874-696=（874+4）-（696+4）=878-700=178

1.25×25×3.2=1.25×25×4×8=（1.25×8）×（25×4）=10×100=1000

Answer 5

874-696=874-700+4=174+4=178
1.25*25*3.2=1.25*25*4*0.8=1.25*0.8*25*4=1*100=100

Answer 6

874-696=880-690=170+8