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87.5-0.2*35.4 =87.5-0.2x35.4 =87.5-2x3.54 =87.5-7.08 =80+7.5-7.08 =80+0.42 =80.42
8.75+(87.5-0.2)x35.4能巧算吗?直接计算 8.75+(87.5-0.2)×35.4 =8.75+87.3×35.4 =8.75+3090.42 =3099.17
四道递等式87.5-0.2*35.4 =87.5-7.08 =80.42 8.75+(87.5-0.2)*35.4 =8.75+87.3*35.4 =8.75+3090.42 =3099.17 8.75+(87.5-0.2*35.4)=8.75+(87.5-7.08)=8.75+80.42 =89.17 (1.3+(16.9-0.87/0.3))*8.5 =(1.3+(16.9-2.9))*8.5 =(1.3+14)*8...
35.4-18.27+6.9能巧算吗?巧算就是按照正常顺序算