1樓:只剩相片
你這個中間卻符號啊, 2/5-1/6+2/3 ()1-1/4+2/5() 1/2+5/6-1/3() 8/9-5/9+1/6
如果是算四道題的話。
2/5-1/6+2/3 =2/5+(4/6-1/6)=2/5+1/2=7/10
1-1/4+2/5=3/4+2/5=23/20=1-0.25+0.4=1.15=23/20
8/9-5/9+1/6=(8/9-5/9)+1/6=1/3+1/6=1/2
這個真的沒有什麼很大的技巧性。
計算下面各題,能簡便計算的要簡便計算。 2/5-1/6+2/3 1-1/4+2/5 1/2+5/6-1/3 8/9-5/9+1/6
2樓:鞠翠花喻書
你這個中間卻符號啊,
2/5-1/6+2/3
()1-1/4+2/5()
1/2+5/6-1/3()
8/9-5/9+1/6
如果是算四道題的話。
2/5-1/6+2/3
=2/5+(4/6-1/6)=2/5+1/2=7/101-1/4+2/5=3/4+2/5=23/20=1-0.25+0.4=1.15=23/20
8/9-5/9+1/6=(8/9-5/9)+1/6=1/3+1/6=1/2
這個內真的沒有什麼很大的技巧性容。
計算下面各題,能簡便計算的要簡便計算。 3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4 = = = = = =
3樓:吃葷的兔子
3/5+3/4-5/6 8/9+2/7+5/7 15/8-3/4-1/4
=36/60+45/60-50/60 =8/9+1 =15/8-1
=31/60 =17/9 =7/8
9/7-1/6+3/7 7/4-12/23-3/4 5-6(3/8+1/6)
= 12/7-1/6 = 1-12/23 =5-(9/4+1)
= 72/42-7/42 =11/23 =7/4
=65/42
計算下面各題,能簡便計算的用簡便方法計算 2-6/13÷9/26 (1/3+1/4)×36 6/7×(4/5-2/3)÷1/5
4樓:數學新綠洲
2-6/13÷9/26
= 2- (6/13)×(26/9)
=2- 4/3
=2/3
.(1/3+1/4)×36
=(1/3)×36 +(1/4)×36
=12+9
=21.
6/7×(4/5-2/3)÷1/5
=(6/7)×(4/5 - 2/3)×5
=(6/7)×(4 - 10/3)
=(6/7)×(2/3)
=4/7
.3/4-3/4×4/7+9/7
=(3/4)×(1- 4/7)+
9/7=(3/4)×(3/7)+9/7
=(1/4)×(9/7)+ 9/7
=(1/4 +1)×(9/7)
=(5/4)×(9/7)
=45/28
=1又17/28
計算下面各題(能簡便計算的要簡便計算)6.12+3/7+2.88+4/7
5樓:匿名使用者
(6.12+2.88)+(3/7+4/7)=9+1=10
6樓:匿名使用者
6.12十3/7十2.88+4/7
=6.12+2.88十(3/7十4/7)
=9+1=10
計算下面各題.(能簡便的要用簡便方法計算)2.3+3.91÷(22-19.7)21.6÷[64.8-(48.6-2.7×2)]0.25×0
7樓:手機使用者
(1)2.3+3.91÷(22-19.7)=2.3+3.91÷2.3
=2.3+1.7
=4(2)21.6÷[64.8-(48.
6-2.7×2)]=21.6÷[64.
8-(48.6-5.4)]=21.
6÷[64.8-43.2]
=21.6÷21.6
=1(3)0.25×0.03×4
=(0.25×4)×0.03
=1×0.03
=0.03
0.13×3.89+0.13×5.11
=0.13×(3.89+5.11)
=0.13×9
=1.17
(5)10.1×87
=(10+0.1)×87
=10×87+0.1×87
=870+8.7
=878.7
用簡便方法計算下面各題: 3/9×8 3/9×2 6/5×2/15+2/15×4/5 36×(1
8樓:匿名使用者
用簡便方法計算下面各題:
3/9×8 +3/9×2
=3/9×(8+2)
=1/3×10
=10/3
6/5×2/15+2/15×4/5
=2/15×(6/5+4/5)
=2/15×2
=4/15
36×(
專1/3-5/18+7/12)
屬=36×1/3-36×5/18+36×7/12=12-10+21=23
計算下面各題能簡算的要簡算6/5-2/1+3/1
9樓:匿名使用者
6/5-2/1+3/1
5/6-1/2+1/3
=(5-3+2)/6
=4/6
=2/3
=3分之2
10樓:華山論劍
5/6-1/2+1/3=5/6-(3/6-2/6)=5/6-1/6=4/6=2/3
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
11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
12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
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