原式$$=\left( 1+0.21+0.32 \right)\times \left( 0.21+0.32 \right)+\left( 1+0.21+0.32 \right)\times 0.43-\left( 1+0.21+0.32 \right)\times \left( 0.21+0.32 \right)-0.43\times \left( 0.21+0.32 \right)$$  $$=\left[ \left( 1+0.21+0.32 \right)\times \left( 0.21+0.32 \right)-\left( 1+0.21+0.32 \right)\times \left( 0.21+0.32 \right) \right]+\left[ \left( 1+0.21+0.32 \right)\times 0.43-\left( 0.21+0.32 \right)\times 0.43 \right]$$  $$=0+0.43\times \left[ \left( 1+0.21+0.32 \right)-\left( 0.21+0.32 \right) \right]$$  $$=0.43\times 1$$  $$=0.43$$．  故答案选：$$\text{D}$$． 
计算$$\left( 1+0.21+0.32 \right)\times \left( 0.21+0.32+0.43 \right)-\left( 1+0.21+0.32+0.43 \right)\times \left( 0.21+0.32 \right)=$$． 

1) $$1$$ 
2) $$0.21$$ 
3) $$0.32$$ 
4) $$0.43$$ 