小数的简便运算:(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23)

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小数的简便运算:(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23)

(1+0.12+0.23)×(0.12+0.23+0.34)—(1+0.12+0.23+0.34)×(0.12+0.23)
=(1+0.12+0.23)×(0.12+0.23+0.34)-(0.12+0.23)-(0.12+0.23+0.34)×(0.12+0.23)
=(1+0.12+0.23-0.12-0.23)×(0.12+0.23+0.34)-(0.12+0.23)
=0.12+0.23+0.34-0.12-0.23
=0.34