Question

用简便方法计算

19/7+(14/11+17/11)×11/8+14/5
=

14/5×(1.875÷4/5－0.125×5/4)

/是分之.
纠正一下,我那道打错了
是17/9+(14/11+17/11)×11/8+14/5

Answer 1

17/9+(14/11+17/11)×11/8+14/5
=17/9+14/11×11/8+17/11×11/8+14/5
=17/9+14/8+17/8+14/5
=(17/9+17/8)+(14/8+14/5)
=1又14/13
14/5×(1.875÷4/5－0.125×5/4)

=14/5×[(1.875-0.125)×5/4]
=14/5×[4/7×5/4]
=2/1

Answer 2

19/7+(14/11+17/11)×11/8+14/5
= 19/7+31/11 * 11/8+14/5
=19/7+31/8+14/5
=19*40/280 + 31*35/280 + 14*56/280
=(760+1085+784)/280
=2629/280

14/5×(1.875÷4/5－0.125×5/4)
=14/5 * (15/8 ÷ 4/5 - 1/8 × 5/4)
=14/5 * (15/8 × 5/4 - 1/8 ×5/4)
=14/5 * (15/8 - 1/8) * 5/4
=14/5 * 14/8 * 5/4
=49/8