Question

(19.98+8.87+8.87)×2.5怎么简算？

Answer 1

(19.98+8.87+8.87)×2.5简便运算。
解：(19.98+8.87+8.87)×2.5
=（19.98+8.87x2）x2.5
=（9.99x2+8.87x2）x2.5
=（9.99+8.87）x2x2.5
=（10+8.87-0.01）x5
=（18.87-0.01）x5
=18.86x5
=9.43x2x5
=9.43x10
=94.3
答：答案为94.3。

Answer 2

（19.98＋8.87＋8.87）×2.5
＝（28.85＋8.87）×2.5
＝37.72×5×0.5
＝188.6×0.5
＝94.3

Answer 3

(19.98+8.87+8.87)×2.5
=(20-0.02+10-1.13+10-1.13)×2.5
=[(20+10+10)-(0.02+1.13+1.13)}×2.5
=(40-2-0.28)×2.5
=40×2.5-2×2.5-0.28×2.5
=100-5-0.7
=94.3

Answer 4

[(19+8+8+0.98+0.87+0.87)]x2.5=
(35+1+0.85+0.87)*2.5=
(36+1+0.72)*2.5=(38-0.28)*2.5
=(40-2-0.3-0.02)*2.5
=100-5-0.75-0.005=100-5.755