题目内容

(1)(111+999)÷[56×(
3
7
-
3
8
)]
(2)200.5×10%+2.005×490+0.2005×5000
(3)3333×3333+9999×8889
(4)
1
1×4
+
1
4×7
+
1
7×10
+…+
1
97×100

(5)若3.5×[6.8-(1.6+△÷0.9)÷8.4=0.5,求△的值.
(1))(111+999)÷[56×(
3
7
-
3
8
)]
=1110÷[56×
3
7
-56×
3
8
]
=1110÷[24-21]
=1110÷3
=370
(2)200.5×10%+2.005×490+0.2005×5000
=20.05×1+20.05×49+20.05×50
=2005
(3)3333×3333+9999×8889
=1111×9999+9999×8889
=9999×10000
=99990000  
(4)
1
1×4
+
1
4×7
+
1
7×10
+…+
1
97×100

=(1-
1
4
+
1
4
-
1
4
+
1
7
-
1
10
+…+
1
97
-
1
100
)×
1
3

=
99
100
×
1
3

=
33
100

(5)由3.5×[6.8-(1.6+△÷0.9)÷8.4=0.5,
可知3.5×[6.8-(1.6+△÷0.9)=0.5×8.4=4.2,
6.8-(1.6+△÷0.9)=4.4÷3.5=1.2,
(1.6+△÷0.9)=6.8-1.2=5.6
△÷0.9=5.6-1.6=4,
△=4×0.9=3.6.
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