解方程.(1)9x-2x=33.6(2)40x-15x=0.75(3)8x+3x+9.1=20.1(4)76x-52x-
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解方程.
(1)9x-2x=33.6
(2)40x-15x=0.75
(3)8x+3x+9.1=20.1
(4)76x-52x-1.2=3.6
(5)78÷2-3x=22.5
(6)35x-9×1.5=21.5.
(1)9x-2x=33.6
(2)40x-15x=0.75
(3)8x+3x+9.1=20.1
(4)76x-52x-1.2=3.6
(5)78÷2-3x=22.5
(6)35x-9×1.5=21.5.
(1)9x-2x=33.6,
7x=33.6,
7x÷7=33.6÷7,
x=4.8;
(2)40x-15x=0.75,
25x=0.75,
25x÷25=0.75÷25,
x=0.03;
(3)8x+3x+9.1=20.1,
11x+9.1=20.1,
11x+9.1-9.1=20.1-9.1,
11x=11,
11x÷11=11÷11,
x=1;
(4)76x-52x-1.2=3.6,
24x-1.2=3.6,
24x-1.2+1.2=3.6+1.2,
24x=4.8,
24x÷24=4.8÷24,
x=0.2;
(5)78÷2-3x=22.5,
39-3x=22.5,
39-3x+3x=22.5+3x,
3x+22.5=39,
3x+22.5-22.5=39-22.5,
3x=16.5,
3x÷3=16.5÷3,
x=5.5;
(6)35x-9×1.5=21.5,
35x-13.5=21.5,
35x-13.5+13.5=21.5+13.5,
35x=35,
35x÷35=35÷35,
x=1.
7x=33.6,
7x÷7=33.6÷7,
x=4.8;
(2)40x-15x=0.75,
25x=0.75,
25x÷25=0.75÷25,
x=0.03;
(3)8x+3x+9.1=20.1,
11x+9.1=20.1,
11x+9.1-9.1=20.1-9.1,
11x=11,
11x÷11=11÷11,
x=1;
(4)76x-52x-1.2=3.6,
24x-1.2=3.6,
24x-1.2+1.2=3.6+1.2,
24x=4.8,
24x÷24=4.8÷24,
x=0.2;
(5)78÷2-3x=22.5,
39-3x=22.5,
39-3x+3x=22.5+3x,
3x+22.5=39,
3x+22.5-22.5=39-22.5,
3x=16.5,
3x÷3=16.5÷3,
x=5.5;
(6)35x-9×1.5=21.5,
35x-13.5=21.5,
35x-13.5+13.5=21.5+13.5,
35x=35,
35x÷35=35÷35,
x=1.
解方程.(1)9x-2x=33.6(2)40x-15x=0.75(3)8x+3x+9.1=20.1(4)76x-52x-
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