问题
解答题
脱式计算.(能简算的要简算)
|
答案
(1)
+3 8
+4 9
+5 8
,5 9
=(
+3 8
)+(5 8
+4 9
),5 9
=1+1,
=2;
(2)12.04-5.37-4.63,
=12.04-(5.37+4.63),
=12.04-10,
=2.04;
(3)(
+4 5
+1 6
)×30,4 15
=
×30+4 5
×30+1 6
×30,4 15
=24+5+8,
=29+8,
=37;
(4)
×[1 8
÷(1 2
×3 5
)],10 9
=
×[1 8
÷1 2
],2 3
=
×1 8
,3 4
=
;3 32
(5)32×71.1+28.9×32,
=(71.1+28.9)×32,
=100×32,
=3200;
(6)(
+1 2
)÷(1 4
÷4-4 5
),1 10
=
÷(3 4
-1 5
),1 10
=
÷3 4
,1 10
=7.5.