题目内容
【题目】怎样算简便就怎样算.
①46×8﹣120÷15
②×+÷7
③6.28+7.13﹣(5.13+3.28)
④
⑤(12.5×8﹣40)÷0.6
⑥(﹣)×72.
【答案】360;;5;;100;49
【解析】
试题分析:②④⑥运用乘法分配律简算;③运用加法结合律简算;①⑤按照先算乘除,再算加减,有括号的先算括号里面的顺序计算.
解:①46×8﹣120÷15,
=368﹣8,
=360;
②×+÷7,
=×+×,
=()×,
=1×,
=;
③6.28+7.13﹣(5.13+3.28),
=6.28+7.13﹣5.13﹣3.28,
=(6.28﹣3.28)+(7.13﹣5.13),
=3+2,
=5;
④,
=+×﹣×,
=+﹣,
=2﹣,
=;
⑤(12.5×8﹣40)÷0.6,
=(100﹣40)÷0.6,
=60÷0.6,
=100;
⑥(﹣)×72,
=×72﹣×72×72,
=30﹣8+27,
=22+27,
=49.
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