tính nhanh
a)33.55+33.67+45.33+672
b) -64+1043 -12.1042 + 48 .104-503
c) 2016.2018 - 20172
a) Ta có: \(33\cdot55+33\cdot67+45\cdot33+67^2\)
\(=\left(33\cdot55+33\cdot45\right)+\left(33\cdot67+67^2\right)\)
\(=33\cdot\left(55+45\right)+67\left(33+67\right)\)
\(=33\cdot100+67\cdot100\)
\(=100\cdot\left(33+67\right)\)
\(=100\cdot100\)
\(=10000\)
c) Ta có: \(2016\cdot2018-2017^2\)
\(=\left(2017-1\right)\left(2017+1\right)-2017^2\)
\(=2017^2-1-2017^2\)
\(=-1\)
tính nhanh
a) 202^2 -54^2+256.352
b)621^2-769.373-148^22
c)33.55+33.67+45.33+67.67
d)47^2+48^2-25+94.48
giúp mk vs ah mk tí nx pk nộp r ah!!!!
c) Ta có: \(33\cdot55+33\cdot67+45\cdot33+67\cdot67\)
\(=33\left(55+45\right)+67\left(33+67\right)\)
\(=33\cdot100+67\cdot100\)
\(=100\cdot100=10000\)
2. tính nhanh:
a) (100 + 67 ) x 67 + (200 - 33 ) x 33
Tính nhanh:
a, 32 x 11 + 32 x 67 + 78 x 68
b, 76 x 41 + 21 x 24 - 76 x 20
a,= 32.(11+67) +78.68
32.78+78.68
78.(32+68)
78.100
= 7800
b,76.(41-20)+21.24
=76.21+21.24
=21.(76+24)
=21.100
=2100
Tính nhanh:
\(\frac{33.44^2+55^3.33}{45.33^2-99.33^4}\)
\(\frac{33.44^2+55^3.33}{45.33^2-99.33^4}\)
\(=\frac{33.121.16+121.25.33}{5.9.33^2-11.9.33^2.33^2}\)
\(=\frac{33.121\left(16+25\right)}{1089.9.\left(5-11.1089\right)}\)
\(=\frac{3993.41}{9801.\left(-11974\right)}\)
\(=-\frac{163713}{117357174}\).
\(\frac{33.44^2+55^3.33}{45.33^2-99.33^4}\)
=\(\frac{33.\left(4.11\right)^2+\left(5.11\right)^3.33}{9.5.33^2-9.11.33^4}\)
=\(\frac{33.16.11^2+125.11^3.33}{33^2.9.\left(5-11.33^2\right)}\)
= \(\frac{33.11^2.\left(16+125.11\right)}{33^2.9.\left(-11974\right)}\)
= \(\frac{132.1391}{33.9.\left(-107766\right)}\)
= \(\frac{183612}{-32006502}\)
mik ko chắc chắn lắm
Cảm ơn 2 bạn nha
Mình sẽ nghiên cứu bài này
Cảm ơn nhiều
Tinh nhanh:A=(-154).67+154.(-33)-46.
Giúp mình với. Cho mình cách làm nhé(nếu có thể) .Tks
A= (-154).67 + (-154).33.(-46)
A= (-154).[67+33.(-46)]
Tự tính nốt nhé
A=(-154).64+154.(-33)-46
A=154.(-64)+154.(-33)-46
A=154.[(-64)+(-33)]-46
A=154.(-100)-46
A=(-15400)-46
A=-15446
Tính nhanh:a) \(\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right).\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{12}\right)\)
b)\(\frac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
Tính nhanh:
a) \({52^2}\) b) \({98^2}\)
a) \(52^2\)
\(=\left(50+2\right)^2\)
\(=50^2+2\cdot2\cdot50+2^2\)
\(=2500+200+4\)
\(=2704\)
b) \(98^2\)
\(=\left(100-2\right)^2\)
\(=100^2-2\cdot100\cdot2+2^2\)
\(=10000-400+4\)
\(=9604\)
`a, 52^2 = (50+2)^2 = 2500 + 200 + 4 = 2704`
`b, 98^2 = (100-2)^2 = 100^2 - 2 . 100 . 2 + 4 = 10000 - 400 + 4`
`= 9604`
tính nhanh:
a.25,4:2,5:4
b.2:28x7
