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7.8比2.4=2比x

7.8:2.4=2:x 解:7.8×x=2.4×2 7.8x=4.8 x=4.8÷7.8 x=8/13

3:8 = x:2.4 8x = 3 * 2.4 8x = 7.2 x = 0.9 希望我的回答对您有帮助,满意请采纳,谢谢。

7.8X+2.4X=20.4 10.2X=20.4 X=2

解:9x=20.4 x=20.4/9 x=2.26 6无限循环

2.1/x:=7/8 7x=2.1×8 7x=16.8 x=16.8÷7 x=2.4

未知数移到等号一边常数移到另一边5.8-2x=1.4(2-0.6)然后2x移到右边2x=5.8-1.42x=4.4即x=2.2

5.4x=10.8 x=2 2x=31.4-18 2x=13.4 x=6.7 x+1=3 x=2 x-4=2 x=6

(2.4+2.1×24/7)×(1×8+1/5) =(2.4+0.3×24)×(8+1/5) =2.4×4×41/5 =78.72。

8.24+7.65×2.4+11.76 =(8.24+11.76)+7.65×﹙2+0.4﹚ =20+﹙15.3+3.06﹚ =20+18.36 =38.36

1.6x+2.4=7.2 1.6x=7.2-2.4 1.6x=4.8 x=3 3.4x-6=4.2 3.4x=10.2 x=3 7.8x+5=44 7.8x=39 x=5 1. 苹果树=2x+10 2. 电子琴=3x-100 3. 设乙队每天修x千米 20x+20×0.1=3.9 20x=3.9-2 20x=1.9 x=0.095 答:乙队每天修0.095米 4. 设一共花了x元 x-2×59....

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