100t-120(t-0.5)要正确的,这题我一直搞不懂.
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100t-120(t-0.5)要正确的,这题我一直搞不懂.100t-120(t-0.5)要正确的,这题我一直搞不懂.100t-120(t-0.5)要正确的,这题我一直搞不懂.原式=100t-120t+
100t-120(t-0.5)要正确的,这题我一直搞不懂.
100t-120(t-0.5)
要正确的,这题我一直搞不懂.
100t-120(t-0.5)要正确的,这题我一直搞不懂.
原式=100t-120t+120*0.5
=-20t+60
100t-120(t-0.5)要正确的,这题我一直搞不懂.
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