Toán Lớp 5: 1.Tính 2/9×9/2=, 3/7÷7/3 2.Tìm x .x-3/4=8/9 ,x-(1/4+1/8)=5/8
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Toán Lớp 5: 1.Tính 2/9×9/2=, 3/7÷7/3 2.Tìm x .x-3/4=8/9 ,x-(1/4+1/8)=5/8
Comments ( 2 )
2/9xx9/2
=(\cancel{2}xx\cancel{9})/(\cancel{9}xxcancel{2})
=1
3/7:7/3
=3/7xx3/7
=(3xx3)/(7xx7)
=9/49
Bài 2. Tìm x
x-3/4=8/9
=>x=8/9+3/4
=>x=32/36+27/36
=>x=59/36
Vậy x=59/36
x-(1/4+1/8)=5/8
=>x-(2/8+1/8)=5/8
=>x-3/8=5/8
=>x=5/8+3/8
=>x=8/8
=>x=1
Vậy x=1