0.55÷0.90.55 0.55×0.90.55
7.3÷0.0173×100 7.3÷0.373÷3
-2.7=2.7 6.54+=8 8.41.6=10 9.54.8=4.7
772×0.6772 0.7×10.17×1.01 0.27÷0.090.27×0.09