问题
解答题
求未知数x
x÷12=640
(82-34)×x=3552
526-x=237
372+x=528.
答案
(1)x÷12=640
x÷12×12=640×12
x=7680;
(2)(82-34)×x=3552
48x=3552
48x÷48=3552÷48
x=74;
(3)526-x=237
526-x+x=237+x
526-237=237+x-237
x=289;
(4)372+x=528
372+x-372=528-372
x=156.