1又13/15*7+1又8/15*28 简便运算 80/4又1/2*0.125/(1-7/9) 7又1/2*3.8+1/5/2/15 47.5*1/5+28*0.2+24.5/5
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1又13/15*7+1又8/15*28
=28/15x7+23/15x28
=28/15x7+28/15x23
=28/15x(7+23)
=28/15x23
=56
80/4又1/2*0.125/(1-7/9)
=(80x0.125)÷(9/2x2/9)
=10 ÷1
=10
7又1/2*3.8+1/5/2/15
=15/2x3.8+0.2x15/2
=15/2x(3.8+0.2)
=15/2x4
=30
47.5*1/5+28*0.2+24.5/5
=47.5x0.2+28x0.2+24.5x0.2
=(47.5+28+24.5)x0.2
=100x0.2
=20
如果本题有什么不明白可以追问,如果满意记得采纳
如果有其他问题请另发或点击向我求助,答题不易,请谅解,谢谢。
祝学习进步!
1又13/15*7+1又8/15*28
=28/15x7+23/15x28
=28/15x7+28/15x23
=28/15x(7+23)
=28/15x23
=56
80/4又1/2*0.125/(1-7/9)
=(80x0.125)÷(9/2x2/9)
=10 ÷1
=10
7又1/2*3.8+1/5/2/15
=15/2x3.8+0.2x15/2
=15/2x(3.8+0.2)
=15/2x4
=30
47.5*1/5+28*0.2+24.5/5
=47.5x0.2+28x0.2+24.5x0.2
=(47.5+28+24.5)x0.2
=100x0.2
=20
如果本题有什么不明白可以追问,如果满意记得采纳
如果有其他问题请另发或点击向我求助,答题不易,请谅解,谢谢。
祝学习进步!
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