7.5+9.2=
9﹣2.7=
4.5÷0.9=
8.5×10=
1.2×6=
7.6×4=
4.5÷3=
5.02×4.8=
5.58÷3.1=
①102×4.5
②7.8×6.9+2.2×6.9
③4×37×0.25
④8×(20﹣1.25)
①5x+5.5=7
②7(ⅹ﹣1.2)=2.1
③2ⅹ÷2.3=4.56
④5.9x﹣2.4x=7.