小学5年级数学题: 简便方法计算题: (2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)*(
(2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)*(2.17+5.49)...
(2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)*(2.17+5.49)
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(2.17+5.49+3.81)睁镇*(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)*(2.17+5.49)
=(2.17+5.49+3.81)*(5.49+2.17)+(2.17+5.49+3.81)悉蚂粗*9.2-(3.81+2.17+5.49)*(2.17+5.49)物尺-9.2*(2.17+5.49)
=(2.17+5.49+3.81)*9.2-9.2*(2.17+5.49)
=(2.17+5.49)*9.2+3.81*9.2-9.2*(2.17+5.49)
=3.81*9.2
=35.052
=(2.17+5.49+3.81)*(5.49+2.17)+(2.17+5.49+3.81)悉蚂粗*9.2-(3.81+2.17+5.49)*(2.17+5.49)物尺-9.2*(2.17+5.49)
=(2.17+5.49+3.81)*9.2-9.2*(2.17+5.49)
=(2.17+5.49)*9.2+3.81*9.2-9.2*(2.17+5.49)
=3.81*9.2
=35.052
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(2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)*(2.17+5.49)
A*(b+9.2)-(A+9.2)*B
a*(b+c)-(a+c)*b
A*b+A*C-A*B-B*C
(a-b)*c
用记事本洞册简单缺带化了下,纳扮宏有啥不懂的问我
A*(b+9.2)-(A+9.2)*B
a*(b+c)-(a+c)*b
A*b+A*C-A*B-B*C
(a-b)*c
用记事本洞册简单缺带化了下,纳扮宏有啥不懂的问我
追问
看不懂,能不能用汉字多一点?
追答
把2.17+5.49+3.81设为a 2.17+5.49设为b 9.2设为c,把式子展开就OK了
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(乎晌2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.81+2.17+5.49+9.2)*(2.17+5.49)岁源锋裂银
=(2.17+5.49+3.81)*(5.49+2.17)+(2.17+5.49+3.81)*9.2-(3.81+2.17+5.49)* (2.17+5.49)-9.2* (2.17+5.49)
=(2.17+5.49+3.81)*9.2-9.2* (2.17+5.49)
=9.2*3.81
=(10-0.8)*3.81
=10*3.81-0.8*3.81
=38.1-3.048
=35.052
=(2.17+5.49+3.81)*(5.49+2.17)+(2.17+5.49+3.81)*9.2-(3.81+2.17+5.49)* (2.17+5.49)-9.2* (2.17+5.49)
=(2.17+5.49+3.81)*9.2-9.2* (2.17+5.49)
=9.2*3.81
=(10-0.8)*3.81
=10*3.81-0.8*3.81
=38.1-3.048
=35.052
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原式=(2.17+5.49+3.81)*(5.49+2.17+9.2)-(3.81+2.17+5.49)*(2.17+5.49)+9.2*(2.17+5.49)纤弊穗=(2.17+5.49+3.81)*(5.49+2.17+9.2-2.17-5.49)-9.2*(2.17+5.49)=9.2*(毁卜2.17+5.49+3.81-2.17-5.49)卜或=35.052
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=(2.17+5.49)*(3.81+9.2)罩枯-(3.81+9.2+1)*(虚樱2.17+5.49)
=(2.17+5.49)-(3.81+9.2-3.81-9.2-1)
=7.66+1
=8.66
我这么给力 追加点悬物誉洞赏分嘛
=(2.17+5.49)-(3.81+9.2-3.81-9.2-1)
=7.66+1
=8.66
我这么给力 追加点悬物誉洞赏分嘛
追问
你貌似算错了,正确答案是35.052 ^_^
追答
好嘛,我也用计算器算了一下,错了,那怎么呀,我还演算了的,
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