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

÷[×(﹣0.25)]

③()×15×17

④8.8﹣6.75+9.2﹣0.25

⑤4.86×[1÷(2.1﹣2.09)]

×16.31﹣2.31÷

⑦84×0.75+×17﹣

+……+

【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;

÷[×(﹣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;

×16.31﹣2.31÷

×16.31﹣2.31×

×(16.31﹣2.31)

×14

=10;

⑦84×0.75+×17﹣

=(84+17﹣1)×

=100×

=75;

+……+

=1﹣+++++

=1﹣

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