[(12/25−0.28)×5/13+1÷(3/4+1/3)]×119/20.
问题描述:
[(1
−0.28)×2 25
+1÷(5 13
+3 4
)]×11 3
. 19 20
答
[(1
-0.28)×2 25
+1÷(5 13
+3 4
)]×11 3
,19 20
=[(1
+2 25
)×7 25
+1÷5 13
]×113 12
,19 20
=[
×34 25
+5 13
]×12 13
,39 20
=
×34 25
×5 13
+39 20
×12 13
,39 20
=
+51 50
,9 5
=
.141 50