用简便方法计算(1)[45-(79-1112+56)×36]÷5(2)-29×(-92)+(-29)×3435+29×2335.-数学
题文
用简便方法计算 (1)[45-(
(2)-
|
答案
(1)[45-(
=[45-
=(45-28+33-30)÷5, =(78-58)÷5, =20÷5, =4; (2)-
=
=
=
=
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题文
用简便方法计算 (1)[45-(
(2)-
|
答案
(1)[45-(
=[45-
=(45-28+33-30)÷5, =(78-58)÷5, =20÷5, =4; (2)-
=
=
=
=
|