怎样简便怎样算. 7.9×125×0.8 8.68-3.49-3.51 5.39×79+21×5.39 5.46×101-5.46.
展开全部
①7.9×125×0.8
=7.9×(125×0.8)
=7.9×100
=790
②8.68-3.49-3.51
=8.68-(3.49+3.51)
=8.68-7
=1.68
③5.39×79+21×5.39
=5.39×(79+21)
=5.39×100
=539
④5.46×101-5.46
=5.46×(100-1)
=5.46×100-5.46×1
=546-5.46
=540.54
=7.9×(125×0.8)
=7.9×100
=790
②8.68-3.49-3.51
=8.68-(3.49+3.51)
=8.68-7
=1.68
③5.39×79+21×5.39
=5.39×(79+21)
=5.39×100
=539
④5.46×101-5.46
=5.46×(100-1)
=5.46×100-5.46×1
=546-5.46
=540.54
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