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(-2)+(-3) = -(2+3) = -5 (-2)-(-3) = (-2)+3 =1 (+5)+(-15) = (-10) 10-5+3-4+6-7 = 3 42-8-(+2)-2 = 30 4-2-3+5-2 = 2 |
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3. 정수와 유리수 곱셈 나눗셈
( + ) × ( - ) = ( - ) ( +2 ) × ( -3 ) = ( -6 ) ( -4 ) × ( +5 ) = ( -20 ) ( -2 ) × ( -3 ) × ( -4 ) = ( -24 ) ( + ) ÷ ( - ) = ( - ) ( +8 ) ÷ ( -4 ) = ( -2 ) ( -4 ) ÷ ( +8 ) = ( -0.5 ) ( -8 ) ÷ ( -2 ) ÷ ( -2 ) = ( -2 ) |
( - ) × ( - ) = ( + ) ( -2 ) × ( -3 ) = ( +6 ) ( -2 ) × ( +2 ) × ( -3 ) = ( +12 ) ( +2 ) × ( -3 ) × ( -4 ) = ( +24 ) ( - ) ÷ ( - ) = ( + ) ( -4 ) ÷ ( -2 ) = ( +2 ) ( -8 ) ÷ ( +2 ) ÷ ( -2 ) = ( +2 ) ( +8 ) ÷ ( -2 ) ÷ ( -2 ) = ( +2 ) |
( -3 )² = ( -3 ) × ( -3 ) = 9 -3² = -( 3 × 3 ) = -9 ( -3 )⁴ = ( -3 ) × ( -3 ) × ( -3 ) × ( -3 ) = 3⁴ ( -3 )³ = ( -3 ) × ( -3 ) × ( -3 ) = ( +9 ) × ( -3 ) = ( -27 ) ( -3 )⁵ = ( -3 ) × ( -3 ) × ( -3 ) × ( -3 ) × ( -3 ) = -3⁵ |
셈의 순서 곱셈, 나눗셈을 먼저한 후 덧셈, 뺄셈을 한다