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简介:
①a÷b÷c=a÷(b×c)
3.52÷2.5÷0.4
=3.52÷(2.5×0.4)
=3.52÷1
=3.52
②a÷(b×c)=a÷b÷c
3.9÷(1.3×5)
=3.9÷1.3÷5
=3÷5
=0.6
③(a±b)÷c=a÷c±b÷c
150.15÷1.5
=(150+0.15)÷1.5
=150÷1.5+0.15÷1.5
=100+0.1
=100.1
④a÷c±b÷c=(a±b)÷c
27÷4.5+18÷4.5
=(27+18)÷4.5
=45÷4.5
=10
⑤a÷(b÷c)=a÷b×c
3.9÷(1.3÷5)
=3.9÷1.3×5
=3×5
=15
⑥a÷b×c=a÷(b÷c)
16.8÷4.8×2.4
=16.8÷(4.8÷2.4)
=16.8÷2
=8.4
⑦a×(b÷c)=a×b÷c
8×(12.5÷2)
=8×12.5÷2
=100÷2
=50
⑧a×b÷c=a×(b÷c)
3.9×7.6÷3.8
=3.9×(7.6÷3.8)
=3.9×2
=7.8