摘要：5×4×0= 18a+2a=

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0×7= 2.6+0.4= 15÷0.01= 21.2-21=
18a+2a= 0.72÷0.8= 0.4×0.4= 0.12÷0.04=
0.8×100= 2.5×4×0=

0×7=2.6+0.4=15÷0.01=21.2-21=18a+2a=0.72÷0.8=0.4×0.4=0.12÷0.04=0.8×100=2.5×4×0=