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發問:
1.3y= -27 2. -4y=56 3. -7y= -147 4.y+20=-29 5.y-30=44 6.y-45= -64 7.2y+10= -20 8.3y-20=43 9.-4y+30=78 10.-5y+35= -80 11.7y-45= -122 12.-6y+35= -25 13.3y= -y+40 14.5y=3y-50 15.2y-15= -y+30 16.5y-6= -2y-60 17.-5y+50= -3y-60 18.20+y= -10+4y 19.15-2x=36+5x 20.18-5y=10+7y thx~
最佳解答:
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1.3y= -27 3y/3 = -27/3 y = -9 2. -4y=56 -4y/-4 = 56/-4 y = -16 3. -7y= -147 -7y/-7 = -147/-7 y = 21 4.y+20=-29 y +20 - 20 = -29 - 20 y = -49 5.y-30=44 y - 30 + 30 = 44 + 30 y = 74 6.y-45= -64 y - 45 + 45 = -64 +45 y = -19 7.2y+10= -20 2y + 10 - 10 = -20 - 10 2y = -30 2y/2 = -30/2 y = -15 8.3y-20=43 3y - 20 + 20 = 43 + 20 3y = 63 3y/3 = 63/3 y = 21 9.-4y+30=78 -4y + 30 - 30 = 78 - 30 -4y = 48 -4y/-4 = 48/-4 y = -12 10.-5y+35= -80 -5y + 35 - 35 = -80 - 35 -5y = -115 -5y/-5 = -115/-5 y = 23 11.7y-45= -122 7y - 45 + 45 = -122 + 45 7y = -77 7y/7 = -77/7 y = -11 12.-6y+35= -25 -6y + 35 - 35 = -25 - 35 -6y = -60 -6y/-6 = -60/-6 y = 10 13.3y= -y+40 3y + y = -y + 40 + y 4y = 40 4y/4 = 40/4 y = 10 14.5y=3y-50 5y - 3y = 3y - 50 - 3y 2y = -50 2y/2 = -50/2 y = -25 15.2y-15= -y+30 2y - 15 + y + 15 = -y + 30 + y + 15 3y = 45 3y/3 = 45/3 y = 15 16.5y-6= -2y-60 5y - 6 + 2y + 6 = -2y - 60 + 2y + 6 7y = -54 7y/7 = -54/7 y = -54/7 17.-5y+50= -3y-60 -5y + 50 + 3y - 50 = -3y - 60 + 3y - 50 -2y = -110 -2y/-2 = -110/-2 y = 55 18.20+y= -10+4y 20 + y +10 - y = -10 + 4y + 10 - y 30 = 3y 3y/3 = 30/3 y = 10 19.15-2x=36+5x 15 - 2x - 36 + 2x = 36 +5x - 36 + 2x -21 = 7x 7x/7 = -21/7 x = -3 20.18-5y=10+7y 18 - 5y - 10 + 5y = 10 + 7y - 10 + 5y 8 = 12y 12y/12 = 8/12 y = 2/3
其他解答:
1.3y= -27 y=-9 2. -4y=56 y=-14 3. -7y= -147 y=21 4.y+20=-29 y=-49 5.y-30=44 y=74 6.y-45= -64 y=-19 7.2y+10= -20 2y=-30 y=-15 8.3y-20=43 3y=63 y=21 9.-4y+30=78 -4y=48 y=-12 10.-5y+35= -80 -5y=-115 y=23 11.7y-45= -122 7y=-77 y=-11 12.-6y+35= -25 -6y=-60 y=10 13.3y= -y+40 4y=40 y=10 14.5y=3y-50 2y=-50 y=-25 15.2y-15= -y+30 3y=45 y=15 16.5y-6= -2y-60 7y=-54 y=-54/7 17.-5y+50= -3y-60 -2y=-110 y=55 18.20+y= -10+4y -3y=-30 y=10 19.15-2x=36+5x -7x=21 x=-3 20.18-5y=10+7y -12y=-8 y=8/12 y=2/3 2009-11-23 11:00:56 補充： 樓下的大大 (2)可能有錯喔! 56/-4=-16????
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