\(257.43-43.57+2.19.57+57.62\)
\(=43.\left(257-57\right)+38.57+57.62\)
\(=43.\left(257-57\right)+57.\left(38+62\right)\)
\(=43.200+57.100\)
\(=8600+5700\)
\(=14300\)
3232+32.99+235.68-35.68
101.27+27.99+6363+63.99
4747+47.99+245.53-53.45
4.49.25+5.51.20
125.16.3+80.25.7
43+128+157+72
293+96.14+96.86+107
giai day du nha may ban
tính
4747+47.99+245.53-53.45
4.49.25+5.51.20
tinh
101.27+27.99+6363+63.99
20232-2022.2023
Tính nhanh: 23+(27-7.6)-(94.7-27.99)
tinh nhanh:16+(27-7.6)-(94.7-27.99)
Tính nhanh: 16 + (27-7.6) - (94.7-27.99)
16+(27-6.7)-(94.7-27.99)
Câu 1: (4,5 điểm)
a) Tinh nhanh: 23 + (27 - 7.6) - (94.7 - 27.99)
1.Tính nhanh:16+(27-7.6)-(94-7-27.99)
2.Tính tổng:A=\(\dfrac{2}{1.4}+\dfrac{2}{4.7}+\dfrac{2}{7.10}+...+\dfrac{2}{97.100}\)