题目内容
【题目】能简算的要简算.
17× | ( + )×32 | × + × | × ×16 |
+ × | 44﹣72× | [ ×( ﹣ )]÷ | ÷( + ) |
×16﹣ ×14+ ×70 | ( /span> + )× . |
【答案】解:
①17×
=(16+1)×
=16× +1×
=9+
=9
②( + )×32
= ×32+ ×32
=24+20
=44
③ × + ×
= ×( + )
= ×1
=
④ × ×16
= ×( ×16)
= ×2
=
⑤ + ×
= +
= +
=
⑥44﹣72×
=44﹣30
=14
⑦[ ×( ﹣ )]÷
=[ × ]÷
= ÷
= ×
=
⑧ ÷( + )
= ÷( + )
= ÷
= ×
=
⑨ ×16﹣ ×14+ ×70
= ×(16﹣14+70)
= ×72
=9
⑩( + )×
= × + ×
= +
= +
=
【解析】①先把17分解成16+1,再运用乘法分配律简算;②③⑨⑩根据乘法分配律进行简算;④根据乘法结合律进行简算;⑤先算乘法,再算加法;⑥先算乘法,再算减法;⑦先算减法,再算乘法,最后算除法;⑧先算加法,再算除法.此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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