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简便计算4.75÷2.5+9+1.9（4.3-1.8）x（0.4+8）5/6-1/4+1/32/5÷10x8/52/3÷[(3/7-3/10)÷10]
题目详情
简便计算
4.75÷2.5+9+1.9
（4.3-1.8）x（0.4+8）
5/6-1/4+1/3
2/5÷10x8/5
2/3÷[(3/7-3/10)÷10]
4.75÷2.5+9+1.9
（4.3-1.8）x（0.4+8）
5/6-1/4+1/3
2/5÷10x8/5
2/3÷[(3/7-3/10)÷10]
▼优质解答
答案和解析
4.75÷2.5+9+1.9
=1.9+9+1.9
=2+9+2-0.2
=13-0.2
=12.8
（4.3-1.8）x（0.4+8）
=2.5x(0.4+8)
=2.5x0.4+2.5x8
=1+20
=21
5/6-1/4+1/3
=10/12-3/12+4/12
=11/12
2/5÷10x8/5
=2/5x1/10x8/5
=8/125
2/3÷[(3/7-3/10)÷10]
=2/3÷(9/70÷10)
=2/3÷9/700
=1400/27
=1.9+9+1.9
=2+9+2-0.2
=13-0.2
=12.8
（4.3-1.8）x（0.4+8）
=2.5x(0.4+8)
=2.5x0.4+2.5x8
=1+20
=21
5/6-1/4+1/3
=10/12-3/12+4/12
=11/12
2/5÷10x8/5
=2/5x1/10x8/5
=8/125
2/3÷[(3/7-3/10)÷10]
=2/3÷(9/70÷10)
=2/3÷9/700
=1400/27
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