解方程15%x+25%x=4.2

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解方程15%x+25%x=4.2

解方程15%x+25%x=4.2
解方程15%x+25%x=4.2

解方程15%x+25%x=4.2
40%x=4.2
x= 10.5

15%x+25%x=4.2
0.15x+0.25x=4.2
0.4x=4.2
x=4.2/0.4
x=10.5

X=1.05


15%x+25%x=4.2
40%x=4.2
0.4x=4.2
x=4.2/0.4
x=10.5

15%x+25%x=4.2
则40%x=4.2
则 0.4x=4.2
解得x=10.5

15%x+25%x=4.2
0.15x+0.25x=4.2
0.4x=4.2
x=10.5

额,就是
0.15x+0.25x=4.2
0.4x=4.2
x=4.2/0.4=10.5吧~

40%x=4.2
x=4.2/40%=10.5