3.6*1.2*2.1和7*16.2-16.5*3.4的简便计算
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3.6*1.2*2.1
=1.2*1.2*6.3
=1.44*6.3
=(1+0.4+0.04)*6.3
=6.3+2.52+0.252
=9.072
7*16.2-16.5*3.4
=113.4-33*1.7
=113.4-56.1
=57.3
=1.2*1.2*6.3
=1.44*6.3
=(1+0.4+0.04)*6.3
=6.3+2.52+0.252
=9.072
7*16.2-16.5*3.4
=113.4-33*1.7
=113.4-56.1
=57.3
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