【答案】①x=3;②x=
③x=1.6;④x=15
【解析】
①根據(jù)等式的性質(zhì),在方程兩邊同時(shí)加1.6,再同時(shí)除以9求解;
②根據(jù)等式的性質(zhì),在方程兩邊同時(shí)加
,再同時(shí)除以2求解;
③先化簡(jiǎn),再根據(jù)等式的性質(zhì),在方程兩邊同時(shí)減3.2,再同時(shí)除以4求解;
④根據(jù)等式的性質(zhì),在方程兩邊同時(shí)乘2x,化簡(jiǎn)之后,再同時(shí)除以4求解;
①9x-1.6=25.4
9x=25.4+1.6
9x=27
x=27÷9
x=3
②2x-
=
2x=
+
x=1÷2
x=
③4x+4×0.8=9.6
4x+3.2=9.6
4x=9.6-3.2
x=6.4÷4
x=1.6
④60÷2x=2
2×2x=60
4x=60
x=60÷4
x=15