1樓:回憶
(下)3 v
×8 5
+4 v
÷5 8
,=3 v
×8 5
+4 v
×8 5
,=(3 v
+4 v
)×8 5
,=下×8 5
,=8 5
;(2)3 4
×40%+0.v5×3 5
,=0.v5×0.4+0.v5×0.6,
=0.v5×(0.4+0.6),
=0.v5×下,
=0.v5;
(3)5-v 8
-0.下25,
=5-0.8v5-0.下25,
=5-(0.8v5+0.下25),
=5-下,
=4;(4)下8
35÷0.9×5 6
,=4 v
×5 6
,=下02下.
計算下面各題,能簡算的要簡算 6 5 × 3 8 + 5 8 ÷ 5 6
2樓:神水盟
(1)6 5
×3 8
+5 8
÷5 6
,=6 5
×3 8
+5 8
×6 5
,=6 5
×(3 8
+5 8
),=6 5
×1,=6 5
;(2)7
16×[5
16+(9
16-1 4
÷1 2
)],=7 16
×[516
+(916
-1 2
)],=7 16
×[516
+916
-1 2
],=7 16
×[7 8
-1 2
],=7 16
×3 8
,=21
128;
(3)17 8
-0.35-1.65,
=17 8
-(0.35+1.65),
=17 8
-2,=1 8
;(4)(11-5)÷5 6
×613
,=6÷5 6
×613
,=36 5
×613
,=21665.
計算下面各題,能簡算的要簡算。(脫式計算) (6/35+4/21)÷4/7 2/ 50
3樓:匿名使用者
(6/35+4/21)÷4/7
=6/35×7/4+4/21×7/4
=3/10+1/3
=9/30+10/30
=19/30
2/9÷2/7÷14/15
=2/9×7/2×15/14
=14/18×15/14
=5/6
(5/6-3/4)÷5/12+4/5
=5/6×12/5-3/4×12/5+4/5=2-9/5+4/5
=2-13/5
=-3/5
3/10÷(4/5-1/2)
=3/10×5/4-3/10×2
=3/8-3/5
=15/40-24/40
=-9/40
2/25÷3/7+23/25÷3/7
=(2/25+23/25)÷3/7
=1×7/3
=2又1/3
8/9÷5/6+1/6
=8/9×6/5+1/6
=16/15+1/6
=32/30+5/30
=37/30
=1又7/30
2/3x=16
x=16×3/2
x=24
3/4x+1/4=3/8
3/4x=3/8-1/4
3/4x=1/8
x=1/8×4/3
x=1/6
1/5x-1/2=3/10
1/5x=1/2+3/10
1/5x=8/10
x=8/10×5x=4
4樓:**防騙
6/35x7/4十4/2lx7/4=3/10十1/3=9/30十10/30=19/30
2/9x7/2x1/14=1/185/6
計算下面各題,能簡算的用簡便方法計算。 18.9×9.9 12.5×8.94×0.8 7.4×0.5+7
5樓:l鮁
18.9×9.9
=18.9×(
10-0.1)
=189-1.89
=187.11
12.5×8.94×0.8
=(12.5×0.8)×8.94
=10×8.94
=89.4
7.4×0.5+7.4÷0.5
=7.4×(0.5+2)
=7.4×2.5
=18.5
4.92÷2.4
=2.05
6.8×32+32×3.2
=32×(6.8+3.2)
=320
(8.1-5.6)÷0.8+7.75
=2.5÷0.8+7.75
=10.875
5.92×2.5
=14.8
5.6×(12.5-8.5÷0.85)
=5.6×2.5
=5.6÷0.4
=143.5×[13-(3.12+5.28)]=3.5×(13-8.4)
=3.5×4.6
=16.1
計算下面各題能簡算的要簡算 1/4+(5/8-3/10)×1/13 5/8×4/3+5/8÷3
6樓:匿名使用者
1/4+(5/8-3/10)×1/13
=1/4 +(25/40-12/40)×1/13=1/4+13/40 ×1/13
=10/40 +1/40
=11/40
原式=5/8×4/3+5/8×4/3
=2×(5/8×4/3)
=2×5/6
=5/3
7樓:蹬可愛河岸
1/4+(5/8-3/10)×1/13
=1/4+13/40 ×1/13
=10/40+1/40
=11/40
5/8×4/3+5/8÷3/4
=5/8×(4/3+4/3)
=5/8×8/3
=1又2/3
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