已知5x+0.8=19.3,则3x+12=( ),( )/x=3
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已知5x+0.8=19.3,则3x+12=( ),( )/x=3
已知5x+0.8=19.3,则3x+12=( ),( )/x=3
已知5x+0.8=19.3,则3x+12=( ),( )/x=3
已知5x+0.8=19.3,
x=3.7
则3x+12=(23.1 ),(11.1 )/x=3