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3/4x%2/5x等于7/8

①5 ②1/10 ③2/5

8x=28*5 x=140/8=35/2 5x/8=5_3 x=2*8/5=16/5 x/6=15/7_8/7=1 x=6

3.25×7,.8-7.8(简便计算) =(3.25-1)×7.8 =2.25*7.8 =17.55 (5x-4)÷5=4(解方程) 5x-4=20 5x=24 x=4.8 5x+3×1.2=0(解方程) 5x=-3.6 x=-0.72 (x+0.5)×3=45(解方程) x+0.5=15 x=14.5 如果对你有帮助,请采纳。谢谢。 要采纳最先回答的...

3/20×1.5+3/5x=12.6 解:9/40+0.6x=12.6 0.6x=12.6-9/40 x=99/8 ÷3/5 x=20又5/8 (2/3+x)×3=2/9×4 解:2+3x=8/9 3x=8/9-2 x=-10/9×1/3 x=-10/27 7×7/8-34/7x=22/7 解:49/8-34/7x=22/7 34/7x=49/8-22/7 x=167/56×7/34 x=167/272

3x+4z=7 (1) 2x+3y+z=9 (2) 5x-9y+7z=8 (3) 由(1)得 4z=7-3x z=4分之(7-3x) 将z=4分之(7-3x)带入(2)得 2x+3y+4分之(7-3x)=9 8x+12y+7-3x=36 5x+12y=36-7 5x+12y=29 (4) 将z=4分之(7-3x)带入(3)得 5x-9y+7×4分之(7-3x)=8...

(4/5+3.2)x=2/3 (4/5+16/5)x=2/3 4x=2/3 x=1/6 7/8÷x=4/15 x=7/8÷4/15 x=7/8×15/4 x=105/32 5x÷1/4=5/3 5x×4=5/3 x=1/12 x×5/7×35=5/6 25x=5/6 x=1/30 2/3千克:0.2吨=2/3:200=1:300=1/300 0.4:2/3=2/5:2/3=1/5:1/3=3:5=3/5 3/5平方米:1.5公顷...

9.875-(3又8分之7-75%)+3又4分之1 =9.875-3又8分之7+75%+3又4分之1 =6+4 =10

80%x3分之7+0.8x2分之7-4分之5x1分之7 =(0.8/7)×(3+2-1) =0.8×4/7 =3.2/7 =32/70 =16/35

(X-2)/3=(X-4)/5=(X-6)/7=(X-8)/9 ( =X/11? (X-2)/3=(X-4)/5 ==> 5(x-2)=3(x-4) ==> 5x-10=3x-12 ==> 2x=-2 x=-1 代入检验均成立 所以x=-1

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