题目内容
【题目】(桐庐县)计算,能简算的要简算.
①175+25﹣112
②8.02×99+8.92
③×+×+
④(+)×7×5
⑤×(0.75﹣)
⑥+×(2.5﹣)
【答案】①88;②802.9;③1;④17;⑤;⑥.
【解析】
试题分析:①根据加法结合律进行简算即可;
②把8.92拆成8.02+0.9,再根据乘法分配律进行简算即可;
③根据乘法分配律进行简算即可;
④根据乘法分配律进行简算即可;
⑤把0.75化成分数,先计算减法,再计算乘法;
⑥把2.5化成分数,先计算计算减法,再计算乘法,最后计算加法.
解答:解:
①175+25﹣112,
=(175+25)﹣112,
=200﹣112,
=88;
②8.02×99+8.92,
=8.02×99+8.02+0.9,
=8.02×(99+1)+0.9,
=8.02×100+0.9,
=802+0.9,
=802.9;
③×+×+,
=(+)×+,
=1×+,
=+,
=1;
④(+)×7×5,
=×7×5+×7×5,
=10+7,
=17;
⑤×(0.75﹣),
=×(﹣),
=×,
=;
⑥+×(2.5﹣),
=+×(2﹣),
=+×2,
=+,
=.
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