问题 解答题 求未知数X:X+3.6=9 X÷28=560 X-4.6=4.6. 答案 X+3.6=9, X=9-3.6, X=5.4;X÷28=560, X=560×28, X=15680;X-4.6=4.6, X=4.6+4.6, X=9.2.