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nghĩa trần và các bạn xinh đẹp,học giỏi k cho mk nha
mk nhanh nhất
a) 28 + 55 = 83
45 + 49 = 94
37 + 53 = 90
b) 61 - 18 = 43
53 - 26 = 27
92 - 84 = 8
\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{28}\\{55}\end{array}}\\\hline{\,\,\,\,83}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{45}\\{49}\end{array}}\\\hline{\,\,\,\,94}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{37}\\{53}\end{array}}\\\hline{\,\,\,\,90}\end{array}\)
\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{61}\\{18}\end{array}}\\\hline{\,\,\,43}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{53}\\{26}\end{array}}\\\hline{\,\,\,27}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{92}\\{84}\end{array}}\\\hline{\,\,\,08}\end{array}\)
55+45+75+25=(55+45)+(75+25)=100+100=200
k rùi cho mik kết bn luốn nhé!
90 - 19 - 11 - 45 + 55
= 71 - 11 - 45 + 55
= 60 - 45 + 55
= 15 + 55
= 70
5 - 10 + 15 - 20 + 25 - 30 + 35 - 40 + 45 - 50 + 55
= -5 + -5 + -5 + -5 + -5 + 55
= -25 + 55
= 30
TA CÓ
55-50+45-40+35-30+25-20+15-10+5
=(55-50)+(45-40)+(35-30)+(25-20)+(15-10)+5
=5+5+5+5+5+5
=30 K MÌNH MÌNH K LẠI
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{36}\\{27}\end{array}}\\\hline{\,\,\,\,63}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{18}\\{52}\end{array}}\\\hline{\,\,\,70}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{83}\\{\,\,9}\end{array}}\\\hline{\,\,\,\,92}\end{array}\)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{74}\\{19}\end{array}}\\\hline{\,\,\,\,93}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{55}\\{25}\end{array}}\\\hline{\,\,\,80}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{\,\,\,9}\\{61}\end{array}}\\\hline{\,\,\,\,70}\end{array}\)
6-23+33-45+55-84+94+14= -17+-12+-29+108
= -29+-29+108= -58+108
=50
12+44+45+56+55+88+91+27+9+73
=(12+88)+(44+56)+(45+55)+(91+9)+(27+73)
= 100 + 100 + 100 + 100 + 100
= 100 x 5
= 500
Chúc bạn học tốt!
61-11=50
55+9=64
55+6=61
45+25=70
61-11=50
55+9=64
55+6=61
45+25=70