1.34+1.8+3.66+0.2简便计算
用简便方法计算.12.8-4.9-5.16.75-(0.9+3.75)1.34+1.8+3.66+0.20.96-0.28+0.04-0.7234.82-(4.82+15...
用简便方法计算. 12.8-4.9-5.1 6.75-(0.9+3.75) 1.34+1.8+3.66+0.2 0.96-0.28+0.04-0.72 34.82-(4.82+15.2) 3.28-(2.2-1.28) 13.8-2.99
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(1)12.8-4.9-5.1
=12.8-(4.9+5.1)
=12.8-10
=2.8;
(2)6.75-(0.9+3.75)
=6.75-3.75-0.9
=2.1;
(3)1.34+1.8+3.66+0.2
=(1.34+3.66)+(0.2+1.8)
=5+2
=7;
(4)0.96-0.28+0.04-0.72
=(0.96+0.04)-(0.28+0.72)
=1-1
=0;
(5)34.82-(4.82+15.2)
=34.82-4.82+15.2
=30+15.2
=45.2;
(6)3.28-(2.28-1.2)
=3.28-2.28+1.2
=1+1.2
=2.2;
(7)13.8-2.99
=13.8-(3-0.01)
=13.8-3+0.01
=13.8-3+0.01
=10.8+0.01
=10.81.
=12.8-(4.9+5.1)
=12.8-10
=2.8;
(2)6.75-(0.9+3.75)
=6.75-3.75-0.9
=2.1;
(3)1.34+1.8+3.66+0.2
=(1.34+3.66)+(0.2+1.8)
=5+2
=7;
(4)0.96-0.28+0.04-0.72
=(0.96+0.04)-(0.28+0.72)
=1-1
=0;
(5)34.82-(4.82+15.2)
=34.82-4.82+15.2
=30+15.2
=45.2;
(6)3.28-(2.28-1.2)
=3.28-2.28+1.2
=1+1.2
=2.2;
(7)13.8-2.99
=13.8-(3-0.01)
=13.8-3+0.01
=13.8-3+0.01
=10.8+0.01
=10.81.
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