Question

数学问题(1)急!

Answer 1

更新1:

分数的例题: 5/4 左边是分母
右边是分子。

1) [x+(2x-3)]X2 = 6x-6 2)(8y-9)+(15-2y)=6-18 6y+6=-12 6y=-18 y=-3 3) 4(5÷3m)-2m-8=0 20m-6m-24=0 14m=24 m=12/7 4) 设 x 是其余的陶瓷小猫的金额 100=3(x+3)+4x+7 93=3x+9+4x 84=7x x=12 So
较便宜的陶瓷小猫=12 较贵重的陶瓷小猫=12+3=15 5) [30w+20(w+1)]/(w+(w+1))=24 50w+20=24(2w+1) 50w+20=48w+24 w=2
1)x=(2x-3) x=3 周界=3x4=12cm 2).(8y-9)+(15-2y)=6-18 8y-2y-9+15=6-18 6y=6-18+9-15 6y=-18 y=-3 3)4(5÷3m)-2m-8=0 20/3m-2m=8 20m-6m=24 14m=24 m=24/14 m=12/7 4)设x为其余的陶瓷小猫 100-7=4(x)+3(x+3) 93=4x+3x+9 7x=84 x=12 其余的12元 3只的=12+3=15元 5).30(w)+20(w+1)=24 30w+20w+20=24 50w=24-20 w=0.08公斤 6).16÷(1-1/2-1/6-1/7) =16÷(1-21/42-7/42-6/42) =16÷8/42 =84粒
答 (1) 正方形四边等长 => x = 2x-3 => x =3 周界 = 4x = 4(3) = 12 答 (2) (8y-9)+(15-2y)=6-18 8y - 2y +15 -9 = -12 6y = -12-6 y = -3 答(3) 4(5÷3m)-2m-8=0 20/3m - 2m = 8 (20 /3 - 2)m = 8 (14/3) m = 8 m = 12/7 (4) 设 x = 陶瓷小猫价钱 贵的陶瓷小猫价钱 = x+3 4x + 3(x +3) + 7 = 100 7x + 16 = 100 7x =84 陶瓷小猫价钱= x =12
贵的陶瓷小猫价钱 = x+3 = 15 (5) (30w + 20 (w+1)) / (w+ (w+1)) = 24 50w + 20 = 24(2w +1) 50w - 48 w= 24 - 20 2w = 4 w =2 (6) 设 x = 玻璃珠总数 16 = (1/6)x + (1/7)x + (1/2) x 16 = (1 - (7 + 6 + 21)/42) x 16 = (8/42) x = 84
参考: me