解方程或比例. 4x+3.6×5=50
x-80% x=5. |
(1)4x+3.6×5=50,
4x+18=50,
4x+18-18=50-18,
4x÷4=32÷4,
x=8;
(2)
=1.75 3
,x 6
3x=1.75×6,
3x÷3=10.5÷3,
x=3.5;
(3)x-80%x=5,
0.2x=5,
0.2x÷0.2=5÷0.2,
x=25.
解方程或比例. 4x+3.6×5=50
x-80% x=5. |
(1)4x+3.6×5=50,
4x+18=50,
4x+18-18=50-18,
4x÷4=32÷4,
x=8;
(2)
=1.75 3
,x 6
3x=1.75×6,
3x÷3=10.5÷3,
x=3.5;
(3)x-80%x=5,
0.2x=5,
0.2x÷0.2=5÷0.2,
x=25.