Question

3.6×31.4+62.8×6.4用简便法计算

3.6×31.4+62.8×6.4用简便法计算

Answer 1

解：3.6X31.4十62.8x6.4
=31.4X(3.6十2X6.4)
=31.4X(3.6十12.8)
=31.4X16.4
=124.16X4.1
=124.16X(4十0.1)
=496.64十12.416
=509.056

追答

=31.4X16.4
=125.6X4.1
=125.6X(4十0.1)
=502.4十12.56
=514.96

Answer 2

3.6×31.4+62.8×6.4用简便法计算

=31.4x（3.6+6.4x2）
=31.4x10+31.4x6.4
=314+200.96
=514.96

Answer 3

3.6×31.4+62.8×6.4
=1.8×(2×31.4)+62.8×6.4
=1.8×62.8+62.8×6.4
=62.8×(1.8+6.4)
=62.8×8.2
=514.96

Answer 4

=31.4✘（3.6+2✘6.4）
=31.4✘16.4
=31.4✘（10+6+0.4）
=31.4✘10+31.4✘6+31.4✘0.4
=314+188.4+12.56
=514.96