问题
解答题
①x+456=546
②876-x=198.
答案
(1)x+456=546,
x+456-456=546-456,
x=90;
(2)876-x=198,
876-x+x=198+x,
198+x=876,
198+x-198=876-198,
x=678.
①x+456=546
②876-x=198.
(1)x+456=546,
x+456-456=546-456,
x=90;
(2)876-x=198,
876-x+x=198+x,
198+x=876,
198+x-198=876-198,
x=678.