巧算下列各题(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)(2)(51x68x78)÷(17x34x1.3)(3)(0.81x0.75x0.48)÷(0.25x0.24x0.27)(4)(0.39x0.7)÷(0.56x3.9)
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巧算下列各题(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)(2)(51x68x78)÷(17x34x1.3)(3)(0.81x0.75x0.48)÷(0.25x0.24x0.27)(4)(0.39x0.7)÷(0.56x3.9)
巧算下列各题
(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)
(2)(51x68x78)÷(17x34x1.3)
(3)(0.81x0.75x0.48)÷(0.25x0.24x0.27)
(4)(0.39x0.7)÷(0.56x3.9)
巧算下列各题(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)(2)(51x68x78)÷(17x34x1.3)(3)(0.81x0.75x0.48)÷(0.25x0.24x0.27)(4)(0.39x0.7)÷(0.56x3.9)
(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)=(4.5/1.5)x(7.5/2.5)x(4.8/2.4)=3x3x2=18
(2)(51x68x78)÷(17x34x1.3)=(51/17)x(68/34)x(78/1.3)=3x2x60=360
(3)(0.81x0.75x0.48)÷(0.25x0.24x0.27)=(0.81/0.27)x(0.75/0.25)x(0.48/0.24)=3x3x2=18
(4)(0.39x0.7)÷(0.56x3.9)=(0.39/3.9)x(0.7/0.56)=0.1x(0.7/0.7/0.8)=0.1x1/0.8=1/8
1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)=3*3*2=18
2)(51x68x78)÷(17x34x1.3)=3*2*60=360
3)(0.81x0.75x0.48)÷(0.25x0.24x0.27)=3*3*2=18
4)(0.39x0.7)÷(0.56x3.9)=1/10 * (10/8)=1/8
这些题都一个思想,就是分子分母有约分,先约掉,再运算.望采纳,谢谢
晕
这个也巧算啊
用前面的一个除以后面的一个,再一起相乘
以第一题为例
4.5÷1.5=3
7.5÷2.5=3
4.8÷2.4=2
结果=3*3*2=18
下面雷同
这也太简单了吧, 我给你举个例子额 (axbxc)÷(dxexf)
=axbxc÷d÷e÷f
=a÷dxb÷exc÷f
知道吗?