Toán tính nhanh a,43×31+57×66+43×35 b,19×32+19×71-57 09/09/2021 By Claire tính nhanh a,43×31+57×66+43×35 b,19×32+19×71-57
@Gaumatyuki# a/ 43 x 31 + 57 x 66 + 43 x 35 = ( 31 + 35 ) x 43 + 57 x 66 = 66 x 43 + 57 x 66 = ( 43 + 57 ) x 66 = 100 x 66 = 6600 b/ 19 x 32 + 19 x 71 – 57 = 19 x 32 + 19 x 71 – 19 x 3 = ( 32 + 71 – 3 ) x 19 = 100 x 19 = 1900 Trả lời
43×31+57×66+43×35 =(31+35)×43+57×66 =66×43+57×66 =66×(43+57) =66×100 =6600 19×32+19×71-57 =19×(32+71)-57 =19×103-57 =1900 nhớ vote 5 sao+câu trả lời hay nhất+cảm ơn Trả lời
@Gaumatyuki#
a/ 43 x 31 + 57 x 66 + 43 x 35
= ( 31 + 35 ) x 43 + 57 x 66
= 66 x 43 + 57 x 66
= ( 43 + 57 ) x 66
= 100 x 66
= 6600
b/ 19 x 32 + 19 x 71 – 57
= 19 x 32 + 19 x 71 – 19 x 3
= ( 32 + 71 – 3 ) x 19
= 100 x 19
= 1900
43×31+57×66+43×35
=(31+35)×43+57×66
=66×43+57×66
=66×(43+57)
=66×100
=6600
19×32+19×71-57
=19×(32+71)-57
=19×103-57
=1900
nhớ vote 5 sao+câu trả lời hay nhất+cảm ơn