Đáp án:a) -3/7+5/7.-6/4 = -3/7+(5/7.-6/4)
= -3/7 + -30/28 = -12/28 -30/28 = -42/28
b) = 35/221+ 30/221+ 156/221 = 221/221 = 1
c) = 4-32/27.(3/2)^3 = 4-(32/27.3,375) = 4 - 4 = 0
d) = -6,36- 2,64 = -9
2) a) 2/5-x=1-1/4
=> 2/5 -x-1+1/4=0
=> 8-20x-20+5=0
=> -20x-7=0
=> x = -7/20
b) x -2/9=4/9.27/12
=> x-2/9=108/108
=> x-2/9 = 1
=> x - 2/9 -1 = 0
=> x = 11/9
c) x/182=-6/14.35/91
=> x/182 = -210/1274
=> x = -30
d)
x:9/2^3-(1/3+5/12)=5/36
=>
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