7.7×58-5.8×34+58
=7.7×58-58×3.4+58
=58×（7.7-3.4+1）
=58×5.3
=58×5+58×0.3
=290+17.4
=307.4
七点七乘于五十八减去五点八乘以三十四加五十八
=58x(7.7-3.4-+1)
=58x5.3
=307.4
=7.7*58-5.8*34+58
=77*5.8-5.8*34+58
=58*(77-34+1)
=58*44
=2552
7.7×58-5.8×34+58
=58×（7.7-3.4+1）
=58×5.3
=58×5+58×0.3
=290+17.4
=307.4
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