简便运算:(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23) 用字母方法
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简便运算:(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23)用字母方法简便运算:(1+0.12+0.23)×(0.12+0.23
简便运算:(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23) 用字母方法
简便运算:(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23) 用字母方法
简便运算:(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23) 用字母方法
令x=1+0.12+0.23,y=1+0.12+0.23+0.34
:(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23)
=x*(y-1)-y*(x-1)
=xy-x-xy+y
=y-x
=0.34
简便运算(1+0.12+0.23)X(0.12+0.23+0.34) - (1+0.12+0.34)X(0.12+0.23)
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