1樓:匿名使用者
1/7+2/5+1/3
=15/105+42/105+35/105=57/105+35/105
=92/105
11/8-2/3減1/4
=11/8-1/4-2/3
=11/8-2/8-2/3
=9/8-2/3
=27/24-16/24
=11/24
2樓:
用乘法分配錄,15\17+(15\17)*16=(15\17)*(16+1)=15
能簡便計算的要用簡便計算4/7+1/14-1/2 5/3-3/8-5/8 3/5+3/11+7/5+11 3/4-{5/6-1/3} 10
3樓:匿名使用者
4/7+1/14-1/2
=4/7-1/2 +1/14
=8/14-7/14+1/14
=(8-7+1)/14
=2/14
=1/7
5/3-3/8-5/8
=5/3-(3/8+5/8)
=5/3-1
=2/3
3/5+3/11+7/5+11 3/4-{5/6-1/3}=3/5+7/5+3/11+11
=2+11+3/11
=13+3/11
=13又311
3/4-{5/6-1/3}
=3/4-5/6+1/3
=9/12-10/12+4/12
=(9-10+4)/12
=3/12
=1/4
脫式計算,能簡算就簡算,怎麼算? 1/6+1/5+1/2= 2-4/7+2/9-3/7= 7/8-
4樓:南宮傾城
1/6+1/5+1/2
=5/30+6/30+15/30
=11/30+15/30
=13/15
脫式計算,能簡便的要簡便。5/6+7/9-3/8= 5/8-2/5+1/4 29/24+4/9-5/24= 14/15-(2/3-1/5)=
5樓:匿名使用者
1.19/20+(4/5-7/40)= 38/40+(32/40-7/40)
=38/40+25/40
=63/40
2. 7/9+3/10+2/9+10/17=(7/9+2/9)+3/10+10/17
=1+3/10+10/17
=321/170
脫式計算,能簡便要簡便。 3/5×1/5÷3/5 2/7-5/8×2/7 1/4÷2/3+2/3÷
6樓:小百合
脫式計算,能簡便要簡便。
3/5×1/5÷3/5
=3/5÷3/5×1/5
=1/5
2/7-5/8×2/7
=(1-5/8)×2/7
=3/8×2/7
=3/28
1/4÷2/3+2/3÷4
=3/2÷4+2/3÷4
=(3/2+2/3)÷4
=13/6÷4
=13/24
1/3÷1/5+4/5
=5/3+4/5
=37/15
[1-(1/4+3/8)]÷1/4
=(1-5/8)×4
=3/8×4
=3/2
4/9×3/16+5/12
=1/12+5/12
=1/2
3/9-1/3×3/9
=(1-1/3)×1/3
=2/9
解方程1/2x÷1/4=8
1/2x=2
x=41/4x+2/3=3
1/4x=3-2/3
1/4x=7/3
x=28/3
1/3x+1/2x=5
5/6x=5
x=62/5x+1/3×6=4
2/5x=4-2
2/5x=2
x=52/7x=1/2×3/14
2/7x=3/28
x=3/8
4.5x+x=11/17
5.5x=11/17
x=2/17
x-1/12x=22
11/12x=22
x=24
急急急急急急 脫式計算能簡便的要簡便計算? 一.6分之5加4分之1減3分之2 二.5分之3加10分7減20分之11
7樓:世翠巧
5/6+1/4-2/3
=10/12+3/12-8/12
=5/12
3/5+7/10-11/20
=12/20+14/20-11/20
=15/20
=3/4
7/8-5/12+1/6
=21/24-10/24+4/24
=15/24
=5/8
7/15+2/7+8/15
=(7/15+8/15)+2/7
=1+2/7
=1又2/7
9/10-(1/6+3/5)
=9/10-1/6-3/5
=27/30-5/30-18/30
=4/30
=2/15
5/12-(1/3-1/4)
=5/12-1/3+1/4
=5/12-4/12+3/12
=4/12
=1/3
脫式計算(一共5道題,能簡算的要簡算) 1/2+1/5+3/10 7/8-(
8樓:手機使用者
1,1 2,1/5 3,1 4,8/7 5,4
脫式計算,能簡便的要簡便計算. 14-11.3-1.7 54÷2.5÷0.4 3.2×0.2
9樓:泡沫
(1)14-11.3-1.7,
=14-(11.3+1.7),
=14-13,
=1;(2)54÷2.5÷0.4,
=54÷(2.5×0.4),
=54÷1,
=54;
(3)3.2×0.28+0.28×6.8,=(3.2+6.8)×0.28,
=10×0.28,
=2.8;
(4)80.3-33.3×0.5÷0.37,=80.3-16.65÷0.37,
=80.3-45,
=35.3.
10樓:買群刀仕
3.6÷0.4-1.2×5
=9-6=3
90÷【3.6-1.8】=90/1.8=50
【31.6-11.7】÷2.
5÷0.4=【31.6-11.
7】÷(2.5*0.4)=【31.
6-11.7】÷1=31.7-0.
1-11.7=19.9
3.4×7.8÷3.9=3.4*(7.8÷3.9)=3.4*2=6.8
5.23×4+4.77÷0.25=5.23×4+4.77×4=(5.23+4.77)×4=10×4=40
基本思路就是結合法,分子分母同時放大等倍數
法,再簡單?那就用筆挨個做除法吧!這些很容易理解的,你可以好好的看一下!
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