巧解方程.3x+2.7=5.94 1.3x-0.44=0.6 6.7x+x=23.1 x-0.1x=1.08 4.5x÷

1个回答

  • (1)3x+2.7=5.94,

    3x+2.7-2.7=5.94-2.7,

    3x=3.24,

    3x÷3=3.24÷3,

    x=1.08;

    (2)x-0.1x=1.08,

    (1-0.1)x=1.08,

    0.9x÷0.9=1.08÷0.9,

    x=1.2;

    (3)1.3x-0.44=0.6,

    1.3x-0.44+0.44=0.6+0.44,

    1.3x=1.04,

    1.3x÷1.3=1.04÷1.3,

    x=0.8;

    (4)4.5x÷3=0.9,

    4.5x÷3×3=0.9×3,

    4.5x=2.7,

    4.5x÷4.5=2.7÷4.5,

    x=0.6;

    (5)6.7x+x=23.1,

    ( 6.7+1)x=23.1,

    7.7x÷7.7=23.1÷7.7,

    x=3;

    (6)(7-1.4)x+5=7.8,

    5.6x+5=7.8,

    5.6x+5-5=7.8-5,

    5.6x=2.8,

    5.6x÷5.6=2.8÷5.6,

    x=0.5.