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5/4Ⅹ+5/6Ⅹ=25

5/4Ⅹ+5/6Ⅹ=25 25/12x=25 x=25÷25/12 x=12

解如图。

解:原式=12/5x(5/6+5/4)x24/25 =12/5x24/25x5/6+12/5x24/25x5/4 =(12x24x5)/(5x25x6)+(12x24x5)/(5x25x4) =(12x4)/25+(3x24)/25 =48/25+72/25 =120/25 =24/5 =4.8

(5/8+5/6)÷4/25 =(15/24+20/24)×25/4 =35/24×25/4 =875/96

原方程化为: 1+1/(X+1)+1+1/(X+4)-1-1/(X+2)-1-1/(X+3)=0——化为真分式 1/(X+1)-1/(X+2)=1/(X+3)-1/(X+4) ——选择性移项 1/(X+1)(X+2)=1/(X+3)(X+4) ——两边同时通分, X^2+7X+12=X^2+3X+2 ——去分母, 4X=10 X=5/2 经检验: X=5/2是原方程的解。 ...

原式=5/3×4/3×3/5×7/4×5/7×(-2/3) =-(5/3×3/5)×(4/3×2/3)×(7/4×5/7) =-1×8/9×5/4 =-10/9。

42x(6/5十3/1一7/4) 分子分母全写反了 应该是 =42x(5/6十1/3一4/7) =42*5/6+42*1/3-42*4/7 =35+14-24 =49-24 =25 满意奥

解比例是应用比例的基本性质:在比例里,两个外项的积等于两个内项的积。(过程我写的稍详细些,你可以适当缩减几步。) x:5/4=1.2:3/4 解:3/4x=5/4×1.2 3/4x=3/2 x=3/2÷3/4 x=2 3x:(x+3)=5:6 解:3x×6=(x+3)×5 18x=5x+15 18x-5x=15 13x=15 x=15÷13 ...

4.25+5/6-(5/6-3/4) =4+1/4+3/4+(5/6-5/6) =4+1 =5

(2/3+X)除以5/4=5/6 也就是 (2/3+X)×4/5=5/6 2/3×4/5+4/5X=5/6 4/5X=5/6-8/15 4/5X=25/30-16/30 4/5X=9/30 X=9/30÷4/5 X=9/30×5/4 X=9/24

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