脱式计算(能简算的要简算)(1)1.8×2.58+0.5+1.42×1.8(2)(54.7-17.5)×(0.45÷0.9)(3)1.5×
脱式计算(能简算的要简算)(1)1.8×2.58+0.5+1.42×1.8(2)(54.7-17.5)×(0.45÷0.9)(3)1.5×(0.1÷0.2)-0.18÷0...
脱式计算(能简算的要简算)(1)1.8×2.58+0.5+1.42×1.8(2)(54.7-17.5)×(0.45÷0.9)(3)1.5×(0.1÷0.2)-0.18÷0.36(4)93.6÷[(54.8+45.2)×(6-5.46)].
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(1)1.8×2.58+0.5+1.42×1.8 =1.8×(2.58+1.42)+0.5 =1.8×4+0.5 =7.2+0.5 =7.7; (2)(54.7-17.5)×(0.45÷0.9) =37.2×0.5 =18.6; (3)1.5×(0.1÷0.2)-0.18÷0.36 =1.5×0.5-0.5 =0.75-0.5 =0.25; (4)93.6÷[(54.8+45.2)×(6-5.46)] =93.6÷[100×0.54] =93.6÷54 =1.7
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