题目内容

【题目】怎样算简便就怎样算.

①46×8﹣120÷15

×+÷7

③6.28+7.13﹣(5.13+3.28)

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;

×+÷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;

=+××

=+

=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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