【23.4+15.4×(5+7/3)】×20%(7/3表示七分之三)简便运算
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【23.4+15.4×(5+7/3)】×20%
=[23.4+77+2.2×3]×0.2
=[(23.4+6.6)+77]×0.2
=(30+77)×0.2
=107×0.2
=21.4
=[23.4+77+2.2×3]×0.2
=[(23.4+6.6)+77]×0.2
=(30+77)×0.2
=107×0.2
=21.4
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【23.4+15.4×(5+3/7)】×20%
=[23.4+15.4*38/7]*0.2
=4.68+3.08*38/7
=4.68+0.44*38
=4.68+0.11*152
=4.68+15.2+1.52
=6.2+15.2
=21.4
=[23.4+15.4*38/7]*0.2
=4.68+3.08*38/7
=4.68+0.44*38
=4.68+0.11*152
=4.68+15.2+1.52
=6.2+15.2
=21.4
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