优优班--学霸训练营 > 知识点挑题
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            • 1. 解下列方程.
              x:
              5
              3
              =80%                  
              3
              4
              x-60%x=18.
            • 2. 解比例.
              3:x=9:15        
              x:4=9:6
              3
              4
              1
              3
              =x:16      
              x
              5
              =
              2
              3
            • 3. 解方程
              5:9=4:x                
              3:5=(x+6):20.
            • 4. 求未知数x的值.
              (1)3x+1.4=19.4        
              (2)x:4=9:3.
            • 5. 解比例:
              3
              5
              :x=
              1
              3
              :2               
              x:5=0.46:4.6                    
              18
              111
              =
              x
              222
              1.2
              x
              =
              4
              5
                          
              1.25:0.25=4x:(1.6+0.4)
              3
              4
              :(x+2)=3:12.
            • 6. 解比例.
              21
              x
              =
              32
              8
                                                     
              x:12=
              7
              4
              :2.8
              1
              20
              1
              5
              =(x-10):
              1
              4
                                          
              x
              4.5
              =1:0.25.
            • 7. 计算题.
              (1)22
              1
              2
              ×6%+2.75÷1
              2
              3
              +1.2

              (2)1
              1
              9
              ÷[32
              2
              5
              -(32.4-
              1
              3
              ×0.25)]×12
              (3)3.672÷0.08÷
              2
              13
              +3
              17
              50
              ×3.95÷0.1-33
              2
              5
              ÷2
              2
              9

              (4)
              1
              1×2×3
              +
              1
              2×3×4
              +…+
              1
              48×49×50

              (5)4x-3(20-x)=5x
              (6)5x+
              3
              4
              =2x+5
              3
              4

              (7)x:
              13
              15
              =2 25:3
              1
              4

              (8)
              x-2
              0.2
              -
              x+1
              0.5
              =3
            • 8. 解比例.
              x:12=
              3
              4
              1
              8
                                
              1.5
              2.5
              =
              6
              x

              x:10=
              1
              4
              1
              3
                                 
              x:
              9
              10
              =1.2:2.2.
            • 9. 解比例的依据是    ,其具体内容是    
            • 10. 解比例
              0.6:0.2=x:
              1
              4
                           
              15:x=4:6       
              x:10=0.2:
              4
              5
            0/40

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