請問equal,equals有咩分別?

在加減乘除時, 用equal 用作verb 時第三身單數要加s, 用作noun 時則眾數要加s.
例:
1 + 1 equals 2. (verb)
1 x 1 is the equal of 1 / 1

is 用作第三身單數, are 則用作第一, 二身及眾數.
make 等動詞在第三身單數時要加s = makes, 第一, 二身及眾數時用原式.

equal can be a verb or an adjective .

When it is used as an adjective, it can be followed by "to "
e.g. Women are demanding equal pay for equal work, ie. equal to that of men.

When it is used as a verb , it cannot be followed by "to"
e.g. 1+1 equals 2.

Equal doesn't need to be used in 加減乘除, because it needs to have an "s", so we need to use equals.
其他 I don't know, sorry......