
淘气在计算△×(0.8+ 2)时,误算成△×0.8+ 2,得到的结果比正确结果小100,则△是几?
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解答
△×(0.8+2)-(△×0.8+2)
=0.8×△+2×△-0.8×△-2
=(0.8×△-0.8×△)+(2×△-2)
=2×△-2
=100
则2×△-2=100
2×△=102
△=51
△×(0.8+2)-(△×0.8+2)
=0.8×△+2×△-0.8×△-2
=(0.8×△-0.8×△)+(2×△-2)
=2×△-2
=100
则2×△-2=100
2×△=102
△=51
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