4.87×2.34+4+57×0.766简便运法

4.87×2.34+4+57×0.766简便运法

4.87×2.34+4+57×0.766
=4.87×2.34+4+5.7×7.66
=4.87×2.34+4+5.7×(1-2.34)
=4.87×2.34+4+5.7×1-5.7×2.34
=(4.87-5.7)×2.34+4+5.7
=-0.83×2.34+9.7
=-1.9422+9.7
=7.7578追问是4.87x2.34+4.57x0.766追答4.87x2.34+4.57x0.766
=4.87x2.34+0.457x7.66
=4.87x2.34+0.457x(1-2.34)
=4.87x2.34+0.457-0.457×2.34
=(4.87-0.457)×2.34+0.457
=4.413×2.34+0.457这也不好算啊再看看题

4.87×2.34+4+57×0.766
=4.87x2.34+4+5.7x7.66
=4.87x2.34+4+4.87x7.66+0.83x7.66
=4.87x(2.34+7.66)+4+1x7.66-0.17x7.66
=4.87x10+4+7.66-0.2x7.66+0.03x7.66
=48.7+11.66-1.532+0.2298
=60.36+0.2298-1.532
=60.5898-1.532
=59.0578

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