脱式计算.78+14×6 15×8×7 312×(300-296)408÷4-75.
(1)78+14×6
=78+84
=162;
(2)15×8×7
=120×7
=840;
(3)312×(300-296)
=312×4
=1248;
(4)408÷4-75
=102-75
=27.
=78+84
=162;
(2)15×8×7
=120×7
=840;
(3)312×(300-296)
=312×4
=1248;
(4)408÷4-75
=102-75
=27.
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