题目内容
【题目】(能简便的要用简便方法计算.
6.3×8.7+8.7×3.7
(﹣+)×12
3÷﹣÷3
0.625×(8.3﹣2.5×0.12)
×+÷
÷[×(+)]
【答案】6.3×8.7+8.7×3.7=87;
(﹣+)×12=5;
3÷﹣÷3=6;
0.625×(8.3﹣2.5×0.12)=5;
+=5;
÷[×(+)]=.
【解析】
试题分析:(1)根据乘法分配律来解答;
(2)根据乘法分配律,将括号内三项分别乘12,然后解答;
(3)根据四则混合运算顺序解答;
(4)根据四则混合运算顺序,先将括号内乘法,然后按顺序计算;
(5)先将算式后面的除法化成乘法形式,然后根据乘法分配律来解答;
(6)根据四则混合运算顺序解答.
解:6.3×8.7+8.7×3.7
=8.7×(6.3+3.7)
=8.7×10
=87;
(﹣+)×12
=
=4﹣2+3
=5;
3÷﹣÷3
=3×﹣
=7﹣
=6;
0.625×(8.3﹣2.5×0.12)
=0.625×(8.3﹣0.3)
=0.625×8
=5;
+
=
=
=
=5;
÷[×(+)]
=÷(×)
=
=
=.
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