Current location - Training Enrollment Network - Mathematics courses - 20 1 1-20 12 winter vacation homework's answer The first volume of seventh-grade mathematics is in urgent need of Hubei Education Press! ! ! ! ! ! ! ! Kneel down and ask everyone for help ~
20 1 1-20 12 winter vacation homework's answer The first volume of seventh-grade mathematics is in urgent need of Hubei Education Press! ! ! ! ! ! ! ! Kneel down and ask everyone for help ~
P 12No. 13: ① 3+6+9+(-1)+8 = 25 ② 3+3+6+3+9+(-10)+(-1)

③25+20 10×5 —25+2005×5=25

P 12No. 14: (78) The sum of absolute values is: 286.

P24 18: ①100x② (12000-72x) ③ solution: when x= 166, w is 16448, and when x =16448.

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