Đề: Tính Nhanh
-147\(\times\)47+(-47)\(\times\)(-47)-300
Đề: Tính Nhanh
-147\(\times\)47+(-47)\(\times\)(-47)-300
=100x47-47x47+47x47-300=4700-300=4400
=100x47-47x47+47x47-300=4700-300=4400
hok tốt
=-147x47+47x47
=47x(-147+47)
=47x(-100)
=-4700
tính nhanh
-147*47+(-47)*(-47)-300
-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
=-47.(147+1-300)
=-47.(-152)
=7144
a) Đặt tính rồi tính.
47 + 35 82 – 47 526 + 147 673 – 147
b) Tính.
350 + 42 - 105 1000 - 300 + 77
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.
Tính nhanh:
\((45\times46+47\times48)\times(51\times52-49\times48)\times(45\times128-90\times64)\times(1995\times1996+1997\times1998)\)
\(=\left(45\cdot128-45\cdot128\right)\cdot\left(45\cdot46+47\cdot48\right)\cdot\left(51\cdot52-49\cdot48\right)\cdot\left(1995\cdot1996+1997\cdot1998\right)\)
=0*A
=0
tính nhanh
\(5\frac{4}{23}\times27\frac{3}{47}+4\frac{3}{47}\times\left(-5\frac{4}{23}\right)\)
cách làm của bạn ko phải là tính nhanh .OK
tính nhanh
(13+47)-(13-125+147)
13+47-13+125-147
=(13-13)+(47-147)+125
=0+(-100)+125
=25
13+ 47-13+125-147. =(13-13)+(47-147)+125 =0+(-100)+125. =25
Tính nhanh: a) 56 x 147 - 56 x 47 + 134
a) 56 x 147- 56 x 47 = 56 x(147- 47) + 134
=56 x 100 +134
=5734
\(56.147-56.47+134=56.\left(147-47\right)+134=56.100+134=5600+134=5734\)
Tính hợp lí
A = (-1) × (-1)^2 × (-1)^3 × (-1)^4 × ...× (-1)^100
B = 125 × (-61) × (-2)^3 × (-1)^2n ( n thuộc N*)
C = 136 × (- 47) + 36 × 47 - (-1)^n ( n lẻ )
Thuc hien phep tinh 1 cach hop li
a, 120 - ( 61) × (-2)^3 × ( -1)^ 2n ( n thuoc N*)
b, 136 × (-47) +36 × 47
c, (-48) + 72 +36 + (-304)
b) \(=-47\left(136-36\right)\)
=\(-47.100=-4700\)