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发表于 2019-9-13 23:46:11 | 显示全部楼层 |阅读模式
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???2015????????????? P4-5 1? 6.9 0.72 0.007 1 0.3 1.6 0.5 4/7 1 2? (1)10.26 (2)1/8 5 (3) 50 3770 (4)1.17 1?1/12 3/4 40 (5)450-m+n 3? B C C C 4? (1)25.5&pide;2.5=10(?)0.5(??) ??????11?????? (2)???????????x???????????2.6x? X+2.6x = 360 3.6x = 360 X = 100 2.6x=2.6*100=260 ??? ?300&pide;5-35=25(?) (3)????????x???????????2x?? 2x+X = 450

3x = 450 X = 150 2x=2*150=300 ??? ?????????x??????(x+12.5)????(x+X+12.5-25=2x-12.5) ? (x+12.5)+x+(2x-12.5)=130 4x = 130 X = 32.5 ??x+12.5=32.5+12.5=45 ??2x-12.5=2*32.5-12.5=52.5 ??? ???? P6-7 1?1 32.36 10.8 0.45 506 0.4 3.4 0 10/19 2? (1)12? 4? (2)3/4 0.7 1 (3) 12 (4)??? ? (5)4 24 3????? 3.8×2.5×0.4 0.5×12.5×8×0.2

=3.8×(2.5×0.4) =(0.5×0.2)×(12.5×8) =3.8×1 = 0.1×100 =3.8 = 10 4????? (1)3.8×180&pide;3.6=190(?) ??? (2)0.16×75= 12 (??) ??????????????????0.16*? = (??) (3)????? 10×4 + 10×1.6&pide;2=48(???) ???? 0.15 × 4 8= 7.2 (??) ??? ???? ????????64????????????4?? ??????????????????? 8 ?; ?????????????(????)???? ?? 2? ?12??? 24? ????????????????????4??6???24? ???? 64-8-24-24=8(?) P8-9 1? ?? 20.7 1.9 72.8 42.42 0.05 6.3 1 1/12 13 2? ?? (1) ?? (2) ?? (3) ??

(4) ?? 3? ?? 0.56×3.68+6.32×0.56 7.8×10.1 =0.56×(3.68+6.32) = 7.8×(10+0.1) =0.56×10 = 7.8×10 + 7.8×0.1 =5.6 = 78.78 4? ??? (1)24??=0.24? 65×0.24×2.5=39 (???) 525×39= 20475 (?) ??? (2)600&pide;4-80=70(??/?) ??? (3)???;???????? ????? (???????????12?) ?1440? 5? ??? ????1, 2, 3, 4 ????2, 4, 6, 8 ????3, 6, 9, 12 ????4? 8 12 16 . ?n??n, 2n 3n 4n

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