问题
解答题
用简便方法计算.
4.35+8.68+15.65+1.32
19.32-5.56-3.44+0.68
37.62-(7.62+3.25)
5.49+2.68-3.49+6.32.
答案
①4.35+8.68+15.65+1.32
=(3.45+15.65)+(8.68+1.32)
=19.1+10
=29.1;
②19.32-5.56-3.44+0.68
=19.32+0.68-(5.56+3.44)
=20-9
=11;
③37.62-(7.62+3.25)
=37.62-7.62-3.25
=30-3.25
=26.75;
④5.49+2.68-3.49+6.32
=5.49-3.49+(2.68+6.32)
=2+9
=11.