问题
解答题
解方程.
x+5.4=9.6
x-9=11
x-6.2=4
3x=2.1.
答案
(1)x+5.4=9.6,
x+5.4-5.4=9.6-5.4,
x=4.2;
(2)x-9=11,
x-9+9=11+9,
x=20;
(3)x-6.2=4,
x-6.2+6.2=4+6.2,
x=10.2;
(4)3x=2.1,
3x÷3=2.1÷3,
x=0.7.
解方程.
x+5.4=9.6
x-9=11
x-6.2=4
3x=2.1.
(1)x+5.4=9.6,
x+5.4-5.4=9.6-5.4,
x=4.2;
(2)x-9=11,
x-9+9=11+9,
x=20;
(3)x-6.2=4,
x-6.2+6.2=4+6.2,
x=10.2;
(4)3x=2.1,
3x÷3=2.1÷3,
x=0.7.