解方程.x÷0.57=2.41-1.05x=0.8740.2×(3.5-2x)=0.1 8x-3x=15.62.88÷3x=0.4&...
解方程.x÷0.57=2.41-1.05x=0.8740.2×(3.5-2x)=0.18x-3x=15.62.88÷3x=0.42.4x-0.7=4.1....
解方程.x÷0.57=2.41-1.05x=0.8740.2×(3.5-2x)=0.1 8x-3x=15.62.88÷3x=0.4 2.4x-0.7=4.1.
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(1)x÷0.57=2.4
x÷0.57×0.57=2.4×0.57
x=1.368;
(2)1-1.05x+1.05x=0.874+1.05x
1.05x+0.874=1
1.05x+0.874-0.874=1-0.874
1.05x=0.126
1.05x÷1.05=0.126÷1.05
x=0.12;
(3)0.2×(3.5-2x)=0.1
0.2×(3.5-2x)÷0.2=0.1÷0.2
3.5-2x=0.5
3.5-2x+2x=0.5+2x
0.5+2x=3.5
0.5+2x-0.5=3.5-0.5
2x=3
2x÷2=3÷2
x=1.5;
(4)8x-3x=15.6
5x=15.6
5x÷5=15.6÷5
x=3.12;
(5)2.88÷3x=0.4
2.88÷3x×3x=0.4×3x
1.2x=2.88
1.2x÷1.2=2.88÷1.2
x=2.4;
(6)2.4x-0.7=4.1
2.4x-0.7+0.7=4.1+0.7
2.4x=4.8
2.4x÷2.4=4.8÷2.4
x=2.
x÷0.57×0.57=2.4×0.57
x=1.368;
(2)1-1.05x+1.05x=0.874+1.05x
1.05x+0.874=1
1.05x+0.874-0.874=1-0.874
1.05x=0.126
1.05x÷1.05=0.126÷1.05
x=0.12;
(3)0.2×(3.5-2x)=0.1
0.2×(3.5-2x)÷0.2=0.1÷0.2
3.5-2x=0.5
3.5-2x+2x=0.5+2x
0.5+2x=3.5
0.5+2x-0.5=3.5-0.5
2x=3
2x÷2=3÷2
x=1.5;
(4)8x-3x=15.6
5x=15.6
5x÷5=15.6÷5
x=3.12;
(5)2.88÷3x=0.4
2.88÷3x×3x=0.4×3x
1.2x=2.88
1.2x÷1.2=2.88÷1.2
x=2.4;
(6)2.4x-0.7=4.1
2.4x-0.7+0.7=4.1+0.7
2.4x=4.8
2.4x÷2.4=4.8÷2.4
x=2.
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