问题
解答题
|
答案
(1)452÷20+109×43
=22.6+4687,
=4709.6;
(2)101×92-92,
=(101-1)×92,
=100×92,
=9200;
(3)907×99+907,
=(99+1)×907,
=100×907,
=90700;
(4)274+299+201+326,
=(274+326)+(299+201),
=600+500,
=1100;
(5)6.5×99+6.5,
=(99+1)×6.5,
=100×6.5,
=650;
(6)31.25÷25×0.5,
=1.25÷0.5,
=2.5;
(7)3.8×4.2+38×0.58
=38×0.42+38×0.58
=(0.42+0.58)×38,
=1×0.38,
=38;
(8)13-
+7 8 1 8
=12
+1 8
,1 8
=12
;2 8
(9)(
+1 2
+1 3
)×2×3×41 6
=(
+1 2
+1 3
)×24,1 6
=
×24+1 2
×24+1 3
×24,1 6
=12+8+4,
=24;
(10)
×(3 7
-4 5
)÷2 3 3 15
=
×(3 7
×4 5
-15 3
×2 3
),15 3
=
×(3 7
-12 3
),10 3
=
×3 7
,2 3
=
;2 7
(11)36÷[(
-5 6
)×3]2 3
=36÷[
×3],1 6
=36÷
,1 2
=72;
(12)
÷(1 8
+2.5×1 4
)4 5
=
÷[1 8
+2],1 4
=
×1 8
,4 9
=
.1 18