Question

解方程或解比例．①6×（x+2.1）=18；②x4=1.25；③6x=

解方程或解比例．①6×（x+2.1）=18；②x4=1.25；③6x=20：6．

Answer 1

①6×（x+2.1）=18
          6x+12.6=18
     6x+12.6-12.6=18-12.6
               6x=5.4
            6x÷6=5.4÷6
                x=0.9
 ②

x

4

=1.25

x

4

×4=1.25×4
    x=5
③

6

x

=20：6
 20x=6×6
 20x=36
   x=1.8