题目内容
【题目】用你喜欢的方法计算下面各题.
(1)22.7﹣1.8+17.3﹣18.2
(2)( + )×8+
(3)[ ﹣( ﹣ )]÷
(4)3.4×2.77+0.23×3.4
(5)( + + )×72
(6)+ + + .
【答案】(1)解: 22.7﹣1.8+17.3﹣18.2
=(22.7+17.3)﹣(1.8+18.2)
=40﹣20
=20;
(2)解: ( + )×8+
=( ×8+ ×8)+
=3+ +
=3+( + )
=3+1
=4;
(3)解: [ ﹣( ﹣ )]÷
=[ ﹣ ]÷
= ÷
= ;
(4)解: 3.4×2.77+0.23×3.4
=3.4×(2.77+0.23)
=3.4×3
=10.2;
(5)解: ( + + )×72
= ×72+ ×72+ ×72
=30+8+27
=65;
(6)解: + + +
=( + )+( + )
=1+1
=2
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