题目内容
【题目】计算,能简便的用简便方法计算.
﹣( + )=________ 2.7×3.4+3.4×6.3+3.4=________ 12.5×2.5×32=________
101×98=________ (2.4+2.4÷0.6)× =________ ÷ × =________
[3﹣( ﹣ )]× =________ ÷[( + )÷ ]=________
【答案】 34 1000 9898 3.2
【解析】
(1)根据减去两个数的和等于连续减去这两个数简算;
(2)运用乘法分配律简算;
(3)把32分解成8×4,再运用乘法结合律简算;
(4)把101分解成100+1,再运用乘法分配律简算;
(5)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的乘;
(6)按照从左到右的顺序计算;
(7)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的乘法;
(8)先算小括号里面的加法,再算中括号里面的除法,最后算括号外的除法.
﹣( + ),
= ﹣ ﹣ ,
=1 ,
= ;
2.7×3.4+3.4×6.3+3.4,
=(2.7+6.3+1)×3.4,
=10×3.4,
=34;
12.5×2.5×32,
=12.5×2.5×8×4,
=(12.5×8)×(2.5×4),
=100×10,
=1000;
101×98,
=(100+1)×98,
=100×98+1×98,
=9800+98,
=9898;
(2.4+2.4÷0.6)× ,
=(2.4+4)× ,
=6.4× ,
=3.2;
÷ × ,
= × ,
= ;
[3﹣( ﹣ )]× ,
=[3﹣ ]× ,
= × ,
= ;
÷[( + )÷ ],
= ÷[ ÷ ],
= × ,
= .
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