问题
解答题
解方程.
3×(1.8-x)=4.8
3.5x+x=90×3.4.
答案
(1)3×(1.8-x)=4.8,
3×(1.8-x)÷3=4.8÷3,
1.8-x+x=1.6+x,
1.6+x-1.6=1.8-1.6,
x=0.2;
(2)3.5x+x=90×3.4,
4.5x=306,
4.5x÷4.5=306÷4.5,
x=68.
解方程.
3×(1.8-x)=4.8
3.5x+x=90×3.4.
(1)3×(1.8-x)=4.8,
3×(1.8-x)÷3=4.8÷3,
1.8-x+x=1.6+x,
1.6+x-1.6=1.8-1.6,
x=0.2;
(2)3.5x+x=90×3.4,
4.5x=306,
4.5x÷4.5=306÷4.5,
x=68.