用简便方法计算.(1)3.8+1314+6.2+31114(2)25÷27+35×72(3)(1-213)×26+26÷13×2.-数学
题文
用简便方法计算. (1)3.8+1
(2)
(3)(1-
|
答案
(1)3.8+1
=(3.8+6.2)+(1
=10+5, =15; (2)
=
=(
=1×
=
(3)(1-
=
=
|
题文
用简便方法计算. (1)3.8+1
(2)
(3)(1-
|
答案
(1)3.8+1
=(3.8+6.2)+(1
=10+5, =15; (2)
=
=(
=1×
=
(3)(1-
=
=
|