问题
解答题
解方程.
①4x+5x=198②23y-7y=240③6(4n+5n)=324.
答案
(1)4x+5x=198,
9x=198,
9x÷9=198÷9,
x=22;
(2)23y-7y=240,
16y=240,
16y÷16=240÷16,
y=15;
(3)6(4n+5n)=324,
6×9n=324,
54n=324,
54n÷54=324÷54,
n=6.
解方程.
①4x+5x=198②23y-7y=240③6(4n+5n)=324.
(1)4x+5x=198,
9x=198,
9x÷9=198÷9,
x=22;
(2)23y-7y=240,
16y=240,
16y÷16=240÷16,
y=15;
(3)6(4n+5n)=324,
6×9n=324,
54n=324,
54n÷54=324÷54,
n=6.