Question

(1.25—0.125)×84.8×100.1 怎能简算

Answer 1

解: (1.25—0.125)×84.8×100.1
=1.25×84.8×100.1-0.125×84.8×100.1
=1.25×(80+4.8)×100.1-0.125×(80+4.8)×100.1
=1.25×80×100.1+1.25×0.8×6×100.1-0.125×80×100.1-0.125×8×0.6×100.1
=100×100.1+6×100.1-10×100.1-0.6×100.1
=(100-10)×100.1+(6-0.6)×100.1
=90×100.1+5.4×100.1
=95.4×(100+0.1)
=9540+9.54
=9549.54
祝你开心

追问

- - 不会吧 这么长阿

追答

答案是对的，
或者这么算,你看会不会好一点
(1.25—0.125)×84.8×100.1
=1.25×84.8×100.1-0.125×84.8×100.1
=1.25×8×10.6×100.1-0.125×8×10.6×100.1
=10×10.6×100.1-10.6×100.1
=(10-1)×10.6×100.1
=9×10.6×100.1
=(100+0.1)×9×10.6
=100×10.6×9+0.1×10.6×9
=1060×9+1.06×9
=(1000+60)×9+(1+0.06)×9
=9000+540+9+0.54
=9549.54