问题
解答题
脱式计算.(能简算的必须简算,要有主要简算过程) (
184×0.25+
187
18
6.43×83.8÷6.43×6.43÷83.8÷6.43. |
答案
(1)(
×2 9
+15 4
÷13 5
)÷4 5
,7 3
=(
×2 9
+15 4
×13 5
)÷5 4
,7 3
=(
+5 6
)×13 4
,3 7
=
×49 12
,3 7
=
;7 4
(2)184×0.25+
×15+25%,1 4
=184×0.25+0.25×15+0.25,
=(184+15+1)×0.25,
=200×0.25,
=50;
(3)187
-(15-128 9
),1 9
=(187
+128 9
)-15,1 9
=200-15,
=185;
(4)18
+6.25+74 7
+3.75,3 7
=(18
+74 7
)+(3.75+6.25),3 7
=26+10,
=36;
(5)
÷8+2 3
×1 3
,1 8
=
×2 3
+1 8
×1 3
,1 8
=(
+2 3
)×1 3
,1 8
=1×
,1 8
=
;1 8
(6)6.43×83.8÷6.43×6.43÷83.8÷6.43,
=(6.43÷6.43)×(83.8÷83.8)×(6.43÷6.43),
=1×1×1,
=1.