题目内容
【题目】计算:
3÷ = | ÷10= | ÷ = | ﹣ = |
18× = | ÷ = | ÷(1﹣ × ) | ×[ ÷( + )] |
( ﹣ × )÷ | + × × | 9× + ÷ | ( + )×8+ . |
【答案】解:
①3÷ =3× =14
② ÷10= × =
③ ÷ = × =
④ ﹣ = ﹣ =
⑤18× =3
⑥ ÷ = × =
⑦ ÷(1﹣ × )
= ÷(1﹣ )
= ÷
= ×
=
⑧ ×[ ÷( + )]
= ×[ ÷ ]
= ×[ × ]
= ×
=
⑨( ﹣ × )÷
=( ﹣ )÷
= ÷
= ×
=
⑩ + × ×
= +
= +
=
=
9× + ÷
=9× + ×9
= ×(9+9)
= ×18
=15
( + )×8+
= ×8+ ×8+
=3+ +
=3+( + )
=3+
=3+1
=4
【解析】①②③④⑤⑥根据分数加减乘除法的计算方法解答;⑦⑧⑨⑩根据分数四则混合运算的法则解答;先将分数除法转化成分数乘法,再根据乘法分配律进行简算;根据乘法分配律和加法结合律进行简算.进行分数的四则运算及四则混合运算时,要注意数据特点和运算符号,注意运算顺序,能运用运算定律和性质进行简算的要简算.
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