计算,能用简便方法计算的要用简便方法计算.(512+119) ×12+719;[85+(3-73)]÷173;  ...
计算,能用简便方法计算的要用简便方法计算.(512+119)×12+719;[85+(3-73)]÷173;27×1115+415÷72;121×117×(2009×42...
计算,能用简便方法计算的要用简便方法计算.(512+119) ×12+719;[85+(3-73)]÷173; 27×1115+415÷72;121×117×(2009×42×85).
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(1)(
+
) ×12+
,
=
×12+
×12+
,
=5+
+
,
=5+(
+
),
=5+1,
=6;
(2)[
+(3-
)]÷
,
=[
+
]÷
,
=
×
,
=
;
(3)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)
5 |
12 |
1 |
19 |
7 |
19 |
=
5 |
12 |
1 |
19 |
7 |
19 |
=5+
12 |
19 |
7 |
19 |
=5+(
12 |
19 |
7 |
19 |
=5+1,
=6;
(2)[
8 |
5 |
7 |
3 |
17 |
3 |
=[
8 |
5 |
2 |
3 |
17 |
3 |
=
34 |
15 |
3 |
17 |
=
2 |
5 |
(3)
2 |
7 |
11 |
15 |
4 |
15 |
7 |
2 |
=
2 |
7 |
11 |
15 |
4 |
15 |
2 |
7 |
=
2 |
7 |
11 |
15 |
4 |
15 |
=
2 |
7 |
=
2 |
7 |
(4)
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