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-
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)52.91-311113-18213(4...
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)52.91-311113-18213(4)15-8811+212.
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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
•
3
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=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
•
3
.
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