题目内容
简算. 146+155+254+45 |
1762-73-127 |
101×28 | 5600÷35 |
73×68+32×73 | 142×59-42×59 |
999×999+999 | 125×32×25. |
分析:横向数:
(1)运用加法交换律和结合律解答,
(2)运用减法性质解答,
(3)(5)(6)(7)运用乘法分配律解答,
(4)化35=7×5,再运用除法性质解答,
(8)化32=8×4,再运用乘法结合律解答.
(1)运用加法交换律和结合律解答,
(2)运用减法性质解答,
(3)(5)(6)(7)运用乘法分配律解答,
(4)化35=7×5,再运用除法性质解答,
(8)化32=8×4,再运用乘法结合律解答.
解答:解:(1)146+155+254+45
=(146+254)+(155+45)
=400+200
=600;
(2)1762-73-127
=1762-(73+127)
=1762-200
=1562;
(3)101×28
=100×28+1×28
=2800+28
=2828;
(4)5600÷35
=5600÷7÷5
=800÷5
=160;
(5)73×68+32×73
=73×(68+32)
=73×100
=7300;
(6)142×59-42×59
=59×(142-42)
=59×100
=5900;
(7)999×999+999
=999×(999+1)
=999×1000
=999000;
(8)125×32×25
=(125×8)×(4×25)
=1000×100
=100000.
=(146+254)+(155+45)
=400+200
=600;
(2)1762-73-127
=1762-(73+127)
=1762-200
=1562;
(3)101×28
=100×28+1×28
=2800+28
=2828;
(4)5600÷35
=5600÷7÷5
=800÷5
=160;
(5)73×68+32×73
=73×(68+32)
=73×100
=7300;
(6)142×59-42×59
=59×(142-42)
=59×100
=5900;
(7)999×999+999
=999×(999+1)
=999×1000
=999000;
(8)125×32×25
=(125×8)×(4×25)
=1000×100
=100000.
点评:本题主要考查学生运用简便方法解决问题的能力.
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