7.65+0.87.65 10.23×0.9910.23 4.58÷2.34.58
9.8×59.8÷0.2 b×0.1b+0.1(b≠0) 0.25×0.92.5
9.4-3.2= 2×10%= + = 0.32= 3.14×8=
÷2= 8:13= 1- = × = 870÷29=