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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