①a+b ②5a-b ③2a+b ④6a-26
4.8÷0.6= 1-0.22= 0.34×5= 36÷0.4=
2.19+9.1= 1.6×0.5= 8.4÷7= 9.6÷32=
-= 20÷= 0.77+0.23= +2-+2=
0.3÷0.5= ×7.2= 4000÷80= 1.5×4+6=