Question

tính nhanh

c,93 ×107=

d,127 ²+146 ×127+73 ² 3.

Answer 1

\(c,=\left(100-7\right)\left(100+7\right)=10000-49=9951\\ d,=127^2+2\cdot73\cdot127+73^2=\left(127+73\right)^2=200^2=40000\)

Answer 2

c) 93.107 = (100 - 7)(100 + 7)

= 100^2 - 7^2 = 10000 - 49 

= 9951

d) 127^2 + 146.127 + 73^2

= (127 + 73)^2

= 200^2 = 40000