4.8×3.9+0.39+0.39的简便算式是[ ]A．（4.8+1+1）×3.9
B．4.8×3.9+0.39×2
C．4.8×3.9+0.1×3.9+0.1×3.9=（4.8+0.1+0.1）×3.9C
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