一道数学题:22/7x21/22x(22/7-22/3)x(-7/22)

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一道数学题:22/7x21/22x(22/7-22/3)x(-7/22)一道数学题:22/7x21/22x(22/7-22/3)x(-7/22)一道数学题:22/7x21/22x(22/7-22/3)

一道数学题:22/7x21/22x(22/7-22/3)x(-7/22)
一道数学题:22/7x21/22x(22/7-22/3)x(-7/22)

一道数学题:22/7x21/22x(22/7-22/3)x(-7/22)
22/7x21/22x(22/7-22/3)x(-7/22)
=-(22/7×7/22)x21/22x(22/7-22/3)
=-21/22x(22/7-22/3)
=-21/22×22/7+21/22×22/3
=-3+7
=4

3*(-88/21)*(-7/22)
=4

4

=3x(22/7-22/3)x(-7/22)
=3x22/7x(-7/22)-3*22/3*(-7/22)
=-3+7
=4