解方程. 0.3x+13=25 4x-6×9=98 7x+3x+26=74 3.8x-x=0.56.
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解方程.
0.3x+13=25 | 4x-6×9=98 | 7x+3x+26=74 | 3.8x-x=0.56. |
(1)0.3x+13=25,
0.3x+13-13=25-13,
0.3x=12,
0.3x÷0.3=12÷0.3,
x=40;
(2)4x-6×9=98,
4x-54=98,
4x-54+54=98+54,
4x=152,
4x÷4=152÷4,
x=38;
(3)7x+3x+26=74,
10x+26=74,
10x+26-26=74-26,
10x=48,
10x÷10=48÷10,
x=4.8;
(4)3.8x-x=0.56,
2.8x=0.56,
2.8x÷2.8=0.56÷2.8,
x=0.2.
0.3x+13-13=25-13,
0.3x=12,
0.3x÷0.3=12÷0.3,
x=40;
(2)4x-6×9=98,
4x-54=98,
4x-54+54=98+54,
4x=152,
4x÷4=152÷4,
x=38;
(3)7x+3x+26=74,
10x+26=74,
10x+26-26=74-26,
10x=48,
10x÷10=48÷10,
x=4.8;
(4)3.8x-x=0.56,
2.8x=0.56,
2.8x÷2.8=0.56÷2.8,
x=0.2.
解方程. 0.3x+13=25 4x-6×9=98 7x+3x+26=74 3.8x-x=0.56.
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