请问12.5×172.35-3.64+23.65-4.36的简便运算?
3个回答
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12.5×172.35-3.64+23.65-4.36
=12.5X100+12.5X72+12.5X0.35-(3.64+4.36)+23.65
=1250+12.5X8X9+12.5X0.4-12.5X0.05-8+23.65
=1250+900+5-0.625+15.65
=2150+20.65-0.625
=2170.025
=12.5X100+12.5X72+12.5X0.35-(3.64+4.36)+23.65
=1250+12.5X8X9+12.5X0.4-12.5X0.05-8+23.65
=1250+900+5-0.625+15.65
=2150+20.65-0.625
=2170.025
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12.5×172.35
=(10+10/4)×172.35
=1723.5+1723.5/4
=1723.5+430.875
1723.5+430.875-3.64+23.65-4.36
=1723.5+430.875+20.01-4.36
=1723.5+20.01+426.515
=1743.51+426.515
=2167.025
=(10+10/4)×172.35
=1723.5+1723.5/4
=1723.5+430.875
1723.5+430.875-3.64+23.65-4.36
=1723.5+430.875+20.01-4.36
=1723.5+20.01+426.515
=1743.51+426.515
=2167.025
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题目有错误,不能简便,改正如下:
12.5×172.35一3.64十12.5×27.65一4.36
=12.5Ⅹ(172.35十27.65)一(3.64十4.36)
=12.5x200一8
=2500一8
=2492
12.5×172.35一3.64十12.5×27.65一4.36
=12.5Ⅹ(172.35十27.65)一(3.64十4.36)
=12.5x200一8
=2500一8
=2492
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