问题
解答题
解下列方程.
x+18=102
x-7.2=9.9
x÷1.8=3.6
4x=27.
答案
(1)x+18=102,
x+18-18=102-18,
x=84;
(2)x-7.2=9.9,
x-7.2+7.2=9.9+7.2,
x=17.1;
(3)x÷1.8=3.6,
x÷1.8×1.8=3.6×1.8,
x=6.48;
(4)4x=27,
4x÷4=27÷4,
x=
.27 4
解下列方程.
x+18=102
x-7.2=9.9
x÷1.8=3.6
4x=27.
(1)x+18=102,
x+18-18=102-18,
x=84;
(2)x-7.2=9.9,
x-7.2+7.2=9.9+7.2,
x=17.1;
(3)x÷1.8=3.6,
x÷1.8×1.8=3.6×1.8,
x=6.48;
(4)4x=27,
4x÷4=27÷4,
x=
.27 4