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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

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

7.8x+2.4x=20.4 10.2x=20.4 x=20.4÷10.2 x=2

括号x-3点八括号比7=2比七怎么解比例 (x-3.8):7=2:7 x-3.8=2 x=5.8

列竖式计算。8.7x2.4= 8.7×2.4=20.88

7.8-x=2.6 x=7.8-2.6=5.2

x:2/7=2/3:8/9 6x/9=4/21 6x=4x9/21 x=4x3/(7x6) x=2/7

3•75 1•25

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

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