第1个回答 2022-06-05
8.4十2.78十1.6-0.788
=(8.4十1.6)十(2.78-0.78-0.008)
=10十(2-0.008)
=10十1.992
=11.992
第2个回答 2022-06-05
8.4+1.6+2.78-0.788
10+2.78-0.788
12.78-0.788
第3个回答 2022-06-05
=32+2·(80-2)+1.6-0
=32+2·80-2·2+1.6
=32+160-4+1.6
=192-4+1.6
=192-2-2+1.6
=190-2+1.6
=190-(2-1.6)
=190-0.4
=189.6