解方程:x+3.4x=28.6 x-0.78x=0.33 7x-2x=25.5 3.6x+2.9x=4.55.
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解方程: x+3.4x=28.6 | x-0.78x=0.33 |
7x-2x=25.5 | 3.6x+2.9x=4.55. |
(1)x+3.4x=28.6,
4.4x=28.6,
4.4x÷4.4=28.6÷4.4,
x=6.5;
(2)x-0.78x=0.33,
0.22x=0.33,
0.22x÷0.22=0.33÷0.22,
x=1.5;
(3)7x-2x=25.5,
5x=25.5,
5x÷5=25.5÷5,
x=5.1;
(4)3.6x+2.9x=4.55,
6.5x=4.55,
6.5x÷6.5=4.55÷6.5,
x=0.7.
4.4x=28.6,
4.4x÷4.4=28.6÷4.4,
x=6.5;
(2)x-0.78x=0.33,
0.22x=0.33,
0.22x÷0.22=0.33÷0.22,
x=1.5;
(3)7x-2x=25.5,
5x=25.5,
5x÷5=25.5÷5,
x=5.1;
(4)3.6x+2.9x=4.55,
6.5x=4.55,
6.5x÷6.5=4.55÷6.5,
x=0.7.
解方程:x+3.4x=28.6 x-0.78x=0.33 7x-2x=25.5 3.6x+2.9x=4.55.
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