问题
解答题
用简便方法计算下面各题.
|
答案
(1)3.06-2.5+1.94, =3.06+1.94-2.5, =5-2.5, =2.5; (2)3.8+3.98+6.02, =3.8+(3.98+6.02), =3.8+10, =13.8; (3)9.53-(4.53+2.4), =9.53-4.53-2.4, =5-2.4, =2.6; (4)76-9.36-30.64, =76-(9.36+30.64), =76-40, =36; |
=(2.29+6.71)+(3.7+6.3),
=9+10,
=19;
(6)3.25-0.13-1.25-0.87,
=3.25-1.25-(0.13+0.87),
=2-1,
=1.