BÀI 1
a,5/21-7/18
B.11/12-15/16
C,7/25.10/21.9/18
D,7/12:14/18
Bài 2
A.18.35-9.70+100
B.25.16-6.25+30.25
C.-4/7.9/10-1/10.4/7
Bài 3
A.5/7:(X+2)=5/6

Question

BÀI 1 a,5/21-7/18 B.11/12-15/16 C,7/25.10/21.9/18 D,7/12:14/18 Bài 2 A.18.35-9.70+100 B.25.16-6.25+30.25 C.-4/7.9/10-1/10.4/7 Bài 3 A.5/7:(X+2)=5/6

khanhngantoan · Answer

Cii    B&agrave;i 1:    a)5/21-7/18=(-19)/126    b)11/12-15/16=(-1)/48    c)7/25  .  10/21  .  9/18    =2/15  .  9/18    =1/15    d)7/12:14/18=3/4    B&agrave;i 2:    a)18.35-9.70+100    =630-630+100    =0+100    =100    b)25.16-6.25+30.25    =25.(16-6+30)    =25.40    =1000    c)(-4)/7  .  9/10-1/10  .  4/7    =(-4)/7.(9/10+1/0)    =(-4)/7.1    =(-4/7    B&agrave;i 3:    a)5/7:(x+2)=5/6              (x+2)=5/7:5/6                x+2=6/7                 x    =6/7-2                 x=(-8)/7    =>  Vậy x=(-8)/7

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