题目内容
计算下面各题,第二行用简便方法计算.
37+160×8 | (256+140÷28)×6 | 150+90×12-65 |
68×102 | 66×99+66 | 800÷4÷25. |
分析:(1)先算乘法,再算加法;
(2)先算除法,再算加法,最后算乘法;
(3)先算乘法,再算加法,最后算减法;
(4)根据乘法分配律进行计算;
(5)根据乘法分配律进行计算;
(6)根据连除的性质进行计算.
(2)先算除法,再算加法,最后算乘法;
(3)先算乘法,再算加法,最后算减法;
(4)根据乘法分配律进行计算;
(5)根据乘法分配律进行计算;
(6)根据连除的性质进行计算.
解答:解:
(1)37+160×8,
=37+1280,
=1317;
(2)(256+140÷28)×6,
=(256+5)×6,
=261×6,
=1566;
(3)150+90×12-65,
=150+1080-65,
=1230-65,
=1165;
(4)68×102,
=68×(100+2),
=68×100+68×2,
=6800+136,
=6936;
(5)66×99+66,
=66×(99+1),
=66×100,
=6600;
(6)800÷4÷25,
=800÷(4×25),
=800÷100,
=8.
(1)37+160×8,
=37+1280,
=1317;
(2)(256+140÷28)×6,
=(256+5)×6,
=261×6,
=1566;
(3)150+90×12-65,
=150+1080-65,
=1230-65,
=1165;
(4)68×102,
=68×(100+2),
=68×100+68×2,
=6800+136,
=6936;
(5)66×99+66,
=66×(99+1),
=66×100,
=6600;
(6)800÷4÷25,
=800÷(4×25),
=800÷100,
=8.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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计算下面各题,第二行用简便方法计算.
37+160×8 | (256+140÷28)×6 | 150+90×12-65 |
68×102 | 66×99+66 | 800÷4÷25. |