运用简便方法使计算更简单. 234-34-66 528-53-47 435-(135+189) 248-75-25 627-98 ...
运用简便方法使计算更简单.234-34-66528-53-47435-(135+189)248-75-25627-98498+86657+99127+44+73....
运用简便方法使计算更简单. 234-34-66 528-53-47 435-(135+189) 248-75-25 627-98 498+86 657+99 127+44+73.
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(1)234-34-66
=234-(34+66)
=234-100
=134;
(2)528-53-47
=528-(53+47)
=528-100
=428;
(3)435-(135+189)
=435-135-189
=300-189
=111;
(4)248-75-25
=248-(75+25)
=248-100
=148;
(5)627-98
=627-100+2
=527+2
=529;
(6)498+86
=500+86-2
=586-2
=584
;
(7)657+99
=657+100-1
=657-1
=656;
(8)127+44+73
=127+73+44
=200+44
=244.
=234-(34+66)
=234-100
=134;
(2)528-53-47
=528-(53+47)
=528-100
=428;
(3)435-(135+189)
=435-135-189
=300-189
=111;
(4)248-75-25
=248-(75+25)
=248-100
=148;
(5)627-98
=627-100+2
=527+2
=529;
(6)498+86
=500+86-2
=586-2
=584
;
(7)657+99
=657+100-1
=657-1
=656;
(8)127+44+73
=127+73+44
=200+44
=244.
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