1樓:匿名使用者
5又3/7-(5/8+4又3/7)
=5又3/7-5/8-4又3/7
=(5又3/7-4又3/7)-5/8
=1-5/8
=3/8
7/8-1/5-4/5
=7/8-(1/5+4/5)
=7/8-1
=-1/8
簡便計算1 4/9+3/8+5/9 21-3/10-2/10 34/7+11/15+4/15
2樓:匿名使用者
簡便計算
1 4/9+3/8+5/9
=4/9+5/9+3/8
=1+3/8
=1又3/8
21-3/10-2/10
=1-(3/10+2/10)
=1-5/10
=1-1/2
=1/2
34/7+11/15+4/15
=4/7+(11/15+4/15)
=4/7+1
=1又4/7
3樓:home杭好地方
2又1/5-4/7-3/7 =2又1/5-(4/7+3/7) =2又1/5-1 =1又1/5 1又5/6-2/9-7/9 =1又5/6-(2/9+7/9) =1又5/6-1 =5/6 2又4/9-3/11-4/9 =2又4/9-4/9-3/11 =2-3/11 =1又8/11
4樓:dwy雨過天晴
計算機算很容易的再多資料再多量資料也很容易算出來的excel軟體
1.怎麼簡便怎麼計算。 7/8-(1/6+3/8) 5-5/11-6/11 3/4-2/9+1/4
5樓:樂為人師
7/8-(1/6+3/8)
=7/8-1/6-3/8
=7/8-3/8-1/6
=1/2-1/6
=1/3
5-5/11-6/11
=5-(5/11+6/11)
=5-1
=43/4-2/9+1/4
=3/4+1/4-2/9
=1-2/9
=7/9
15又3/8-5又3/4+4.75
=15又3/8-5又3/4+4又3/4
=15又3/8-(5又3/4-4又3/4)=15又3/8-1
=14又3/8
5/8+1/8-0.2
=3/4-0.2
=0.55
7/12-1/4+4/5
=1/3+4/5
=17/15
=1又2/15
7/4+7/8-3/7+1/8 5/8+3/10-1/8+7/10 簡便計算還有怎樣變符號。。
6樓:妙酒
7/4+7/8-3/7+1/8
=(4/7-3/7)+(7/8+1/8)
=1/7+1
=8/7
5/8+3/10-1/8+7/10
=(5/8-1/8)+(3/10+7/10)=1/2+1
=1.5
三、怎麼算簡便就怎樣算。 1/4+3/7+4/7+3/4 2. 8/9-1/4+1/2 3. 3/8+5/6+5/8 4. 2-1/8-7/8 5. 1+3/4-7/12
7樓:匿名使用者
1/4+3/7+4/7+3/4
=1/4+3/4+3/7+4/7
=(1/4+3/4)+(3/7+4/7)
=1+1==2
2. 8/9-1/4+1/2
=8/9+(1/2-1/4)
=8/9+1/4
=32/36+9/36
=41/36
3. 3/8+5/6+5/8
=(3/8+5/8)+5/6
=1+5/6
=11/6
4. 2-1/8-7/8
=2-(1/8+7/8)
=2-1
=15. 1+3/4-7/12
=1+9/12-7/12
=1+1/6
=7/6
6. 5/8+1/4-3/4
=5/8-1/2
=5/8-4/8
=1/8
簡便運算 1 7/25×101-7/25 2(5/6+7/8-5/12)÷1/2 3 75%×3/7+1/7×3/4+3/7×0.75 = = =
8樓:妖精
1 7/25×101-7/25
=7/25×(101-1)
=7/25×100
=282(5/6+7/8-5/12)÷1/2=(5/6+7/8-5/12)×2
=5/6×2+7/8×2-5/12×2
=5/3-5/6+7/4
=5/6+7/4
=10/12+21/12
=31/12
3 75%×3/7+1/7×3/4+3/7×0.75=0.75×(3/7+1/7+3/7)
=0.75×1
=0.75
不懂可追問,有幫助請採納,謝謝!
9樓:燕北風情
1 7/25×
101-7/25=7/25×(100+1)-7/25=28+7/25-7/25
=282(5/6+7/8-5/12)÷1/2=(5/6+7/8-5/12)x2
=5/3+7/4-5/6
=5/6+7/4
=10/12+21/12
=31/12
3 75%×3/7+1/7×3/4+3/7×0.75=3/4x3/7+1/7x3/4+3/7x3/4
=3/4x(3/7+1/7+3/7)
=3/4x1
=3/4
願你學習進步
10樓:匿名使用者
都是結合律和分配率的應用吧
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