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简介:
正用: axb÷c=ax(b÷c)
1.25×64÷8
=1.25×(64÷8)
=1.25×8
=10
正用: a÷b÷c=a÷(bxc)
320÷1.25÷8 3.52÷2.5÷0.4 9.6÷0.8÷4
=320÷(1.25x8) =3.52÷(2.5x0.4) =9.6÷(0.8x4)
=320÷10 =3.52÷1 =9.6÷3.2
=32 =3.52 =3
正用: a÷c-b÷c=(a-b)÷c
117.8÷2.3-4.88÷0.23 8.57÷5-3.57÷5
=(117.8-48.8)÷2.3 =(8.57-3.57)÷5
=69÷2.3 =5÷5
=30 =1
19.8÷0.5-9.8×2 (22.5-15)÷0.5
=19.8×2-9.8×2 =22.5÷0.5-15÷0.5
=(19.8-9.8)×2 =45-30
=10×2 =15
=20