[64-(87-42)]×15 450÷[(84-48)÷12] (58+37)÷(64-9×5) 0.12×4.8÷0.12×4.8.
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(1)[64-(87-42)]×15
=[64-45]×15
=19×15
=285;
(2)450÷[(84-48)÷12]
=450÷[36÷12]
=450÷3
=150;
(3)(58+37)÷(64-9×5)
=(58+37)÷(64-45)
=95÷19
=5;
(4)0.12×4.8÷0.12×4.8
=(0.12÷0.12)×(4.8×4.8)
=1×23.04
=23.04.
=[64-45]×15
=19×15
=285;
(2)450÷[(84-48)÷12]
=450÷[36÷12]
=450÷3
=150;
(3)(58+37)÷(64-9×5)
=(58+37)÷(64-45)
=95÷19
=5;
(4)0.12×4.8÷0.12×4.8
=(0.12÷0.12)×(4.8×4.8)
=1×23.04
=23.04.
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