Toán Lớp 6: 23. (37 − 123) + 123 ⋅ (23 − 37)
25 ⋅ (48 − 13) + 25 ⋅ (−48 + 23)
(−33) ⋅ (35 − 25) − 35 ⋅ (25 − 33)
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Toán Lớp 6: 23. (37 − 123) + 123 ⋅ (23 − 37)
25 ⋅ (48 − 13) + 25 ⋅ (−48 + 23)
(−33) ⋅ (35 − 25) − 35 ⋅ (25 − 33)
Comments ( 2 )
a)23\left( {37 – 123} \right) + 123.\left( {23 – 37} \right)\\
= 23.37 – 23.123 + 123.23 – 123.37\\
= 23.37 – 123.37 – 23.123 + 123.23\\
= 37.\left( {23 – 123} \right) + 0\\
= 37.\left( { – 100} \right)\\
= – 3700\\
b)25\left( {48 – 13} \right) + 25.\left( { – 48 + 23} \right)\\
= 25.48 – 25.13 – 25.48 + 25.23\\
= 25.48 – 25.48 – 25.13 + 25.23\\
= 25.\left( {23 – 13} \right)\\
= 25.10\\
= 250\\
c)\\
\left( { – 33} \right).\left( {35 – 25} \right) – 35.\left( {25 – 33} \right)\\
= – 33.35 + 33.25 – 35.25 + 35.33\\
= \left( { – 33.35 + 35.33} \right) + 33.25 – 35.25\\
= 0 + 25.\left( {33 – 35} \right)\\
= 25.\left( { – 2} \right)\\
= – 50
\end{array}$
(−33) ⋅ (35 − 25) − 35 ⋅ (25 − 33)
(−33) ⋅ (35 − 25) − 35 ⋅ (25 − 33)