解方程 x-0.25x=3x+25x=213.6x÷2=2.16.

2024-09-08 13:59:43


解方程 x-0.25x=3x+25x=213.6x÷2=2.16.

好评回答
(1)x-0.25x=3,
(1-0.25)x=3,
0.75x=3,
0.75x÷0.75=3÷0.75,
x=4;
(2)x+25x=21,
(1+25)x=21,
1.4x=21,
1.4x÷1.4=21÷1.4,
x=15;
(3)3.6x÷2=2.16,
3.6x÷2×2=2.16×2,
3.6x=4.32,
3.6x÷3.6=4.32÷3.6,
x=1.2.