用简便方法计算①14-859-249②15.75+379+224③21518-6721+41318④457-2712+527-4512.-数学
题文
用简便方法计算 ①14-8
③21
|
答案
①14-8
=14-(8
=14-11, =3; ②15.75+3
=15.75+2
=18
=22
③21
=21
|
题文
用简便方法计算 ①14-8
③21
|
答案
①14-8
=14-(8
=14-11, =3; ②15.75+3
=15.75+2
=18
=22
③21
=21
|