题目内容
【题目】计算下面各题,能简算的要简算.
①2.35×4.8+76.5×0.48
②÷[×(﹣0.25)]
③()×15×17
④8.8﹣6.75+9.2﹣0.25
⑤4.86×[1÷(2.1﹣2.09)]
⑥×16.31﹣2.31÷
⑦84×0.75+×17﹣
⑧+……+
【答案】48;2;47;11;486;10;75;
【解析】
①2.35×4.8+76.5×0.48
=2.35×4.8+7.65×4.8
=(2.35+7.65)×4.8
=10×4.8
=48;
②÷[×(﹣0.25)]
=÷[×]
=÷
=2;
③()×15×17
=×15×17+×15×17
=17+30
=47;
④8.8﹣6.75+9.2﹣0.25
=8.8+9.2﹣6.75﹣0.25
=(8.8+9.2)﹣(6.75+0.25)
=18﹣7
=11;
⑤4.86×[1÷(2.1﹣2.09)]
=4.86×[1÷0.01]
=4.86×100
=486;
⑥×16.31﹣2.31÷
=×16.31﹣2.31×
=×(16.31﹣2.31)
=×14
=10;
⑦84×0.75+×17﹣
=(84+17﹣1)×
=100×
=75;
⑧+……+
=1﹣+﹣+﹣+﹣+﹣+﹣
=1﹣
=.
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