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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