Instruction
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Mathematical operations there are four types: addition, subtraction, multiplication, and division. Therefore, examples of the cons will be four types. Negative numbers within the example brackets in order not to confuse the mathematical operation. For example, 6-(-7), 5+(-9), -4*(-3) or 34:(-17).
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Addition. This action may take the form of:1) 3+(-6)=3-6=-3. Replacement steps: first disclosed the brackets, the + sign changes to the opposite, then from the larger (in absolute value) of the number "6" is subtracted least - "3", then the answer will receive a mark greater, that is "-".
2) -3+6=3. This example can be recorded differently ("6-3") or to decide on the principle of "from greater to take less and to give the answer the sign more."
3) -3+(-6)=-3-6=-9. When opening brackets are replaced operations of addition subtraction, then summarizes the modules of the numbers and results put a minus sign.
3
Subtraction.1) 8-(-5)=8+5=13. Disclosed brackets, the sign of the action is reversed, it turns out the addition.
2) -9-3=-12. Sample elements are summarized and an overall "- "sign.
3) -10-(-5)=-10+5=-5. When opening brackets again changed the sign to "+", then from the larger number subtracted from smaller and have the answer - the sign of the larger number.
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Multiplication and division.When performing multiplication or division sign doesn't affect the action itself. If you work or divide numbers with different signs the answer is assigned a minus sign, if the numbers with the same signs, the result is always the sign "plus".1)-4*9=-36; -6:2=-3.
2)6*(-5)=-30; 45:(-5)=-9.
3)-7*(-8)=56; -44:(-11)=4.