① x-20%x=60
② x: =4:7
+x=36 6.5:x=3.25:4
①0.8×(x+5)=32
②0.25x:5=2.1:2
③ x﹣ =
④ x+ x=51
和:;差:。
我补充的条件是:
341-29= 5.7+1.24= -0.25= × =
3.2÷80%= ÷ = ×0+ = 12.5×8÷12.5×8=