(3.6x-5.6×4.5)÷1.5=2.52怎么解方程?
1个回答
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解答:解:(1)3.6x-1.2×4.5=10.8
3.6x-5.4=10.8
3.6x+5.4-5.4=10.8+5.4
3.6x=16.2
3.6x÷3.6=16.2÷3.6
x=4.5;
(2)x-0.36x=4.8
0.64x=4.8
0.64x÷0.64=4.8÷0.64
x=7.5;
(3)1.6(x+5.8)=36
1.6(x+5.8)÷1.6=36÷1.6
x+5.8=22.5
x+5.8-5.8=22.5-5.8
x=16.7;
(4)7.2-1.5x=1.8
7.2-1.8+1.5x-1.5x=1.8+1.5x-1.8
1.5x=5.4
1.5x÷1.5=5.4÷1.5
x=3.6.
3.6x-5.4=10.8
3.6x+5.4-5.4=10.8+5.4
3.6x=16.2
3.6x÷3.6=16.2÷3.6
x=4.5;
(2)x-0.36x=4.8
0.64x=4.8
0.64x÷0.64=4.8÷0.64
x=7.5;
(3)1.6(x+5.8)=36
1.6(x+5.8)÷1.6=36÷1.6
x+5.8=22.5
x+5.8-5.8=22.5-5.8
x=16.7;
(4)7.2-1.5x=1.8
7.2-1.8+1.5x-1.5x=1.8+1.5x-1.8
1.5x=5.4
1.5x÷1.5=5.4÷1.5
x=3.6.
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