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用简便方法计算.①5.38-(1.5+2.38)②5.用简便方法计算.①5.38-(1.5+2.38)②5.68×99+5.68③126×98+126+63×2④44×(511-14)

题目详情
用简便方法计算.①5.38-(1.5+2.38)②5.
用简便方法计算.
①5.38-(1.5+2.38)
②5.68×99+5.68
③126×98+126+63×2
④44×(
5
11
-
1
4






5
11
-
1
4

5
11
551111
1
4

1
4
1144
▼优质解答
答案和解析
①5.38-(1.5+2.38),
=5.38-1.5-2.38,
=(5.38-2.38)-1.5,
=3-1.5,
=1.5;

②5.68×99+5.68,
=(99+1)×5.68,
=100×5.68,
=568;

③126×98+126+63×2,
=126×98+126+126,
=(98+1+1)×126,
=100×126,
=12600;

④44×(
5
11
-
1
4
),
=44×
5
11
-
1
4
×44,
=20-11,
=9.
5
11
555111111-
1
4
),
=44×
5
11
-
1
4
×44,
=20-11,
=9.
1
4
111444),
=44×
5
11
-
1
4
×44,
=20-11,
=9.
5
11
555111111-
1
4
×44,
=20-11,
=9.
1
4
111444×44,
=20-11,
=9.