Đề: Tính Nhanh
-147\(\times\)47+(-47)\(\times\)(-47)-300
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-147*47+(-47)*(-47)-300
\(=-47.\left(147+1-300\right)\)
\(=-47.\left(-152\right)\)
\(=7144\)
học tốt
-147.47+(-47).(-47)-300
=-47.(147-47)-300
=-47.100-300
=-4700-300
=-5000
a)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{47}\\{35}\end{array}}\\\hline{\,\,\,\,82}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{82}\\{47}\end{array}}\\\hline{\,\,\,35}\end{array}\)
\(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{526}\\{147}\end{array}}\\\hline{\,\,\,\,673}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{673}\\{147}\end{array}}\\\hline{\,\,\,526}\end{array}\)
b) 350 + 42 – 105 = 392 – 105 = 287
1 000 – 300 + 77 = 700 + 77 = 777.
\(=\left(45\cdot128-45\cdot128\right)\cdot\left(45\cdot46+47\cdot48\right)\cdot\left(51\cdot52-49\cdot48\right)\cdot\left(1995\cdot1996+1997\cdot1998\right)\)
=0*A
=0
a) 56 x 147- 56 x 47 = 56 x(147- 47) + 134
=56 x 100 +134
=5734
\(56.147-56.47+134=56.\left(147-47\right)+134=56.100+134=5600+134=5734\)
=100x47-47x47+47x47-300=4700-300=4400
=100x47-47x47+47x47-300=4700-300=4400
hok tốt