解方程 17x-25=17.5 5.2x+2.6x=46.8 3x+6.7=8.2.
1个回答

(1)17x-25=17.5,

17x-25+25=17.5+25,

17x=42.5,

17x÷17=42.5÷17,

x=2.5,

(2)5.2x+2.6x=46.8,

7.8x=46.8,

7.8x÷7.8=46.8÷7.8,

x=6,

(3)3x+6.7=8.2,

3x+6.7-6.7=8.2-6.7,

3x=1.5,

3x÷3=1.5÷3,

x=0.5.