问题
解答题
|
答案
(1)4+16÷
,4 5
=4+16×
,5 4
=4+20,
=24;
(2)
÷5 14
×64-1,5 9
=
×5 14
×64-1,9 5
=
-1,288 7
=
;281 7
(3)
×[5 9
-(3 4
-7 16
)],1 4
=
×[5 9
+3 4
-1 4
],7 16
=
×[1-5 9
],7 16
=
×5 9
,9 16
=
;5 16
(4)
×0.53+75%×1.47,3 4
=0.75×0.53+0.75×1.47,
=(0.53+1.47)×0.75,
=2×0.75,
=1.5;
(5)25×3.2×1.25,
=25×0.4×8×1.25,
=10×(8×1.25),
=10×10,
=100;
(6)30
÷5 14
,15 14
=(30+
)×5 14
,14 15
=30×
+14 15
×5 14
,14 15
=28+
,1 3
=28
.1 3