题目内容
(1)(111+999)÷[56×(
-
)]
(2)200.5×10%+2.005×490+0.2005×5000
(3)3333×3333+9999×8889
(4)
+
+
+…+
(5)若3.5×[6.8-(1.6+△÷0.9)÷8.4=0.5,求△的值.
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×(
-
)]
=1110÷[56×
-56×
]
=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-
+
-
+
-
+…+
-
)×
=
×
=
(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.
3 |
7 |
3 |
8 |
=1110÷[56×
3 |
7 |
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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