1.Tính nhanh:
A,(36×28+36×28)÷73
B,(98×17-26×17)÷72
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a) ( 36 x 28 + 36 x 45 ) : 73
= 36 x (28 + 45 ):73
=36 x 73 :73
= 36 x (73 : 73)
= 36 x 1
= 36
b) ( 98 x 17 - 26 x 17 ) : 72
= 17 x (98-17):72
= 17 x 72 :72
=17 x (72 :72)
= 17 x 1
= 17
a) ( 36 x 28 + 36 x 45 ) : 73 = 36
b) ( 98 x 17 - 26 x 17 ) : 72 = 17
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{36}\\{36}\end{array}}\\\hline{\,\,\,\,72}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{73}\\{17}\end{array}}\\\hline{\,\,\,90}\end{array}\)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{28}\\{53}\end{array}}\\\hline{\,\,\,81}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{25}\\{35}\end{array}}\\\hline{\,\,\,60}\end{array}\)
(98x17—17x26):72
=17x(98—26):72
=17x72:72
=17x1
=17
a)(-6-18):(-4)
= { (-6) + (-8) } : (-4)
=(-24) : (-4)= (-6)
b)-28.(50-42)-35.(34-62)
= -28.8-35.(-28)
= -28.(8-35)
= -28.(-27)=756
c)-18-(-5)+26
= -18+5+26
= -13+26=13
d)-72.69+31.(-72)
= -72.(69+31)
= -72.100=-7200
A,(36×28+36×28)÷73
=36x(28+28):73
=36x56:73
=2016:73
=2016/73
B,(98×17-26×17)÷72
=17x(98-26):72
=17x72:72
=17x(72:72)
=17x1
=17
A,(36x28+36x28):73
=36x(28+28):73
=36x56:73
=2016:73
=27(dư45)
B,(98x17-26x17):72
=17x(98-26):72
=17x72:72
=17x(72:72)
=17x1
=17