解:13与6的和是( 19 ) ∵已知需求出13与6的和是多少 A + B = C ∴13 + 6 = (20 - 7)+ (10 - 4) = 20 - 7 + 10 - 4 = 30 + (-7 - 4) = 30 - 11 = 19 答:13与6的和是19
标签:多少
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解:13与6的和是( 19 ) ∵已知需求出13与6的和是多少 A + B = C ∴13 + 6 = (20 - 7)+ (10 - 4) = 20 - 7 + 10 - 4 = 30 + (-7 - 4) = 30 - 11 = 19 答:13与6的和是19
标签:多少