0.25×1.8+3.9(简算

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0.25×1.8+3.9(简算
0.25×1.8+3.9(简算

0.25×1.8+3.9(简算
0.25×1.8+3.9
=0.3*(0.25*6+1.3)
=0.3*(1.5+1.3)
=0.3*2.8
=0.3*(3-0.2)
=0.9-0.06
=0.84