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Addition 、 Subtractive 、 Subtraction 、Division Point Method Calculator
point addition
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C
+
=
+
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B
D
point subtractive
A
C
-
=
-
=
B
D
point subtraction
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C
x
=
x
=
B
D
point Division method
A
C
÷
=
÷
=
B
D
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