巧算下列各题(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)(2)(51x68x78)÷(17x34x1.3
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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)
(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](/uploads/image/z/2295009-9-9.jpg?t=%E5%B7%A7%E7%AE%97%E4%B8%8B%E5%88%97%E5%90%84%E9%A2%98%EF%BC%881%EF%BC%89%EF%BC%884.5x7.5x4.8%EF%BC%89%C3%B7%EF%BC%881.5x2.5x2.4%EF%BC%89%EF%BC%882%EF%BC%89%EF%BC%8851x68x78%EF%BC%89%C3%B7%EF%BC%8817x34x1.3)
(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
(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
巧算下列各题(1)(4.5x7.5x4.8)÷(1.5x2.5x2.4)(2)(51x68x78)÷(17x34x1.3
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