3.7×1.83.7 4.2÷1.54.2 6.21÷0.016.21×100
……
21.5×0.8921.5 54.5÷1.654.5
5.2÷0.25.2 5.88×1.15.88÷1.1
4.6×1546×1.5 73.6÷0.173.6×10
个
261﹣99= 17÷34= 2.1+0.79= 80×125%=
÷36= 38.38÷38= +×0= ×3÷×3=