2x+16=64 (2)2x-7点4=120 (3)

问题描述:

2x+16=64 (2)2x-7点4=120 (3)

(1) 2×=64-16=48,即×=24
(2)2×=120+7.4=127.4即
×=127.4÷2=63.7