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脱式计算,能简算的要简算（1）999/[56x(3/7-3/8)]（2）[0.85-(9/16-0.15)]x8/21（3）3/7/(11/6+2/3)x3/10（4）(1999+1/1997)x1/1998
题目详情
脱式计算,能简算的要简算
（1）999/[56x(3/7-3/8)]
（2）[0.85-(9/16-0.15)]x8/21
（3）3/7/(11/6+2/3)x3/10
（4）(1999+1/1997)x1/1998
（1）999/[56x(3/7-3/8)]
（2）[0.85-(9/16-0.15)]x8/21
（3）3/7/(11/6+2/3)x3/10
（4）(1999+1/1997)x1/1998
▼优质解答
答案和解析
(1) 999/[56x(3/7-3/8)]
=333/[56x(1/7-1/8)]
=333/1
=333
(2) ）[0.85-(9/16-0.15)]x8/21
=(0.85-9/16+0.15)x8/21
=(1-9/16)x8/21
=7/16x8/21
=1/6
(3) 3/7/(11/6+2/3)x3/10
=3/7/(11/20+4/20)
=3/7x4/3
=4/7
(4) (1999+1/1997)x1/1998
=(1998+1+1/1997)x1/1998
=(1998+1998/1997)x1/1998
=1+1/1997
=1998/1997
=333/[56x(1/7-1/8)]
=333/1
=333
(2) ）[0.85-(9/16-0.15)]x8/21
=(0.85-9/16+0.15)x8/21
=(1-9/16)x8/21
=7/16x8/21
=1/6
(3) 3/7/(11/6+2/3)x3/10
=3/7/(11/20+4/20)
=3/7x4/3
=4/7
(4) (1999+1/1997)x1/1998
=(1998+1+1/1997)x1/1998
=(1998+1998/1997)x1/1998
=1+1/1997
=1998/1997
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