x-25%x=4.2 2x+30%x=9.2 (1-60%)x=0.32 x-25%x=4.2 2x+30%x=9.2 (1-60_数学解答

x-25%x=4.2 2x+30%x=9.2 (1-60%)x=0.32
x-25%x=4.2 2x+30%x=9.2 (1-60%)x=0.32

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解答

x(1 - 25%) = 4.2
75%x = 4.2
x = 4.2 ÷ 75%
x = 5.6
x(2 + 30%) = 9.2
2.3x = 9.2
x = 9.2 ÷ 2.3
x = 4
40%x = 0.32
x = 0.32 ÷ 40%
x = 0.8