What is the value of 5x2-1.9x-3.7 for x=-0.3?

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问题 What is the value of 5x2-1.9x-3.7 for x=-0.3?

选项 A、-4.72
B、-3.82
C、-3.58
D、-2.68
E、0.57

答案D

解析 The equation 5×[(-0.3)×(-0.3)]-1.9×(-0.3)-3.7=0.45+0.57-3.7=-2.68.

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What is the value of 5x2-1.9x-3.7 for x=-0.3?

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