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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