题目内容
【题目】准确计算下面各题,能简便计算的要简便计算
(1) + ×( ÷ )
(2)( - )× ÷
(3) ÷[ ×( + )]
(4) + + +
(5) × - ×
(6) ×1.8+19.2×
【答案】(1)
(2)1
(3)
(4)2
(5)
(6)12
【解析】
(1) + ×( ÷ )
= + ×( × )
= + ×
= + ×
=
(2)( - )× ÷
= × ÷
= ÷
= 1
(3) ÷[ ×( + )]
= ÷[ × )]
= ÷
=
(4) + + +
=( + )+( + )
=1+1
=2
(5) × - ×
= ×( - )
= ×
=
(6) ×1.8+19.2×
= ×(1.8+19.2)
= ×21
=12
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