(1)10.1×79
=(10+0.1)×79
=10×79+0.1×79
=790+7.9
=797.9
(2)3375÷(921-73×12)
=3375÷(921-876)
=3375÷45
=75
(3)10÷3.14-6.86÷3.14
=(10-6.86)÷3.14
=3.14÷3.14
=1
(4)[2分之1-(4分之3-7分之3)]÷7分之5
=[2分之1-28分之9]÷7分之5
=28分之5÷7分之5
=4分之1
(1)10.1×79
=(10+0.1)×79
=10×79+0.1×79
=790+7.9
=797.9
(2)3375÷(921-73×12)
=3375÷(921-876)
=3375÷45
=75
(3)10÷3.14-6.86÷3.14
=(10-6.86)÷3.14
=3.14÷3.14
=1
(4)[2分之1-(4分之3-7分之3)]÷7分之5
=[2分之1-28分之9]÷7分之5
=28分之5÷7分之5
=4分之1