(1+0.21+0.32)*(0.21+0.32+0.43)-(1+0.21+0.32+0.43)*(0.21+0.32)
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(1+0.21+0.32)*(0.21+0.32+0.43)-(1+0.21+0.32+0.43)*(0.21+0.32)
(1+0.21+0.32)*(0.21+0.32+0.43)-(1+0.21+0.32+0.43)*(0.21+0.32)
(1+0.21+0.32)*(0.21+0.32+0.43)-(1+0.21+0.32+0.43)*(0.21+0.32)
(1+0.21+0.32)*(0.21+0.32+0.43)-(1+0.21+0.32)*(0.21+0.32)-0.43*(0.21+0.32)
=(1+0.21+0.32)*(0.21+0.32+0.43-0.21+0.32)-0.43*(0.21+0.32)
=(1+0.21+0.32)*0.43-0.43*(0.21+0.32)
=0.43*(1+0.21+0.32-0.21-0.32)
=0.43
令a=0.21+0.32+0.43
则1+0.21+0.32=a+1-0.43
1+0.21+0.32+0.43=a+1
0.21+0.32=a-0.43
原式=a(a+1-0.43)-(a+1)(a-0.43)
=a(a+1)-0.43a-a(a+1)+0.43(a+1)
=0.43(a+1)-0.43a
=0.43a+0.43-0.43a
=0.43
1.53*0.96-1.96*0.53=1.4688-1.0388=0.43
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