Toán Lớp 5: tính 3/7+5/8= 4/9+7/18= 59/56-5/

Question

Toán Lớp 5:  tính  3/7+5/8=                                                  4/9+7/18=                                                      59/56-5/8= 5/6-4/9=                                                   1/+1/3+1/4=                                                 13/12-(1/2+1/3)

minhtamnguyet88 · Answer

Giải đáp+Lời giải và giải thích chi tiết:     3/7 + 5/8 = (3.8)/(7.8) + (5.7)/(8.7) = 24/56 + 35/56 = 59/56     4/6 + 7/18 = (4.2)/(9.2) + 7/18 = 8/18 + 7/18 = 15/18 = 5/6     59/56 - 5/8 = 59/56 - (5.7)/(8.7) = 59/56 - 35/56 = 24/56 = 3/7     5/6 - 4/9 = (5.9)/(6.9) - (4.6)/(9.6) = 45/54 - 24/54 = 21/54 =7/18     1 + 1/3 + 1/4 = (1.3.4)/(1.3.4) + (1.4)/(3.4) + (1.3)/(4.3) = 12/12 + 4/12 +  3/12 = 19/12     13/12 - (1/2+1/3) = 13/12-((1.3)/(2.3) + (1.2)/(3.2)) = 13/12 - (3/6+2/6)    = 13/12 - 5/6  = 13/12 - (5.2)/(6.2) = 13/12 - 10/12 = 3/12 = 1/4

hiennhi98 · Answer

3/7 + 5/8   =24/56 + 35/56   = 59/56   4/9 +7/18 =8/18+7/18   =15/18=5/6    59/56 -5/8   =59/56-35/56   =24/56=3/7   5/6-4/9   =45/54-24/54   =21/54   =7/18   1+1/3+1/4   =12/12+4/12+3/12   =19/12   13/12-(1/2+1/3)   =13/12-(3/6+2/6)   =13/12-5/6   =13/12-10/12   =3/12=1/4