0 20425 20433 20439 20443 20449 20451 20455 20461 20463 20469 20475 20479 20481 20485 20491 20493 20499 20503 20505 20509 20511 20515 20517 20519 20520 20521 20523 20524 20525 20527 20529 20533 20535 20539 20541 20545 20551 20553 20559 20563 20565 20569 20575 20581 20583 20589 20593 20595 20601 20605 20611 20619 199269
=1-
+
）=
与
的和多
，求x。
+
）=
-
=
=
-
=
-x=
-x=
-
=
+
+x=1
=
=
=
=
+
）=
=2.1
x+
x=
+
=
=
=
+
）=