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脱式计算,能简算的要简算.762-408÷4×535×27+57×141.5×[0.02÷(2.1-2.09)]12.5×8.887.58-(7.58+3.8)(29+219)×4+1119.

题目详情
脱式计算,能简算的要简算.
762-408÷4×5 35×
2
7
+
5
7
×14
1.5×[0.02÷(2.1-2.09)]
12.5×8.8 87.58-(7.58+3.8)
2
9
+
2
19
)×4+
11
19
▼优质解答
答案和解析
(1)762-408÷4×5,
=762-102×5,
=762-510,
=252;

(2)35×
2
7
+
5
7
×14,
=10+10,
=20;

(3)1.5×[0.02÷(2.1-2.09)],
=1.5×[0.02÷0.01],
=1.5×2,
=3;

(4)12.5×8.8,
=12.5×(8+0.8),
=12.5×8+12.5×0.8,
=100+10,
=110;

(5)87.58-(7.58+3.8),
=87.58-7.58-3.8,
=80-3.8,
=76.2;

(6)(
2
9
+
2
19
)×4+
11
19

=
2
9
×4+
2
19
×4+
11
19

=
8
9
+
8
19
+
11
19

=
8
9
+(
8
19
+
11
19
),
8
9
+1,
=1
8
9