解方程.
0.5x-1.5=12.5 x+25%x=3.75. |
①
x-1 3
x=121 4
x(
-1 3
)=121 4
x×
=121 12
x×
×12=12×121 12
x=144;
②0.5x-1.5=12.5
0.5x-1.5+1.5=12.5+1.5
0.5x=14
0.5x÷0.5=14÷0.5
x=28;
③x+25%x=3.75
x(1+25%)=3.75
1.25x=3.75
1.25x÷1.25=3.75÷1.25
x=3.
解方程.
0.5x-1.5=12.5 x+25%x=3.75. |
①
x-1 3
x=121 4
x(
-1 3
)=121 4
x×
=121 12
x×
×12=12×121 12
x=144;
②0.5x-1.5=12.5
0.5x-1.5+1.5=12.5+1.5
0.5x=14
0.5x÷0.5=14÷0.5
x=28;
③x+25%x=3.75
x(1+25%)=3.75
1.25x=3.75
1.25x÷1.25=3.75÷1.25
x=3.