6x3.5-1.4x0.5简便计算如下:
6x7x0.5-1.4x0.5
=0.5x(6x7-1.4)
=0.5x40.6
=20.3
简便计算:
6×3.5-1.4×0.5
=6×3.5-0.2×7×0.5
=6.3×3.5-0.2×3.5
=3.5×(6.3-0.2)
=3.5×(6+0.1)
=21+0.35
=21.35
6×3.5-1.4×0.5
=6×3.5-0.2×7×0.5
=6.3×3.5-0.2×3.5
=3.5×(6.3-0.2)
=3.5×(6+0.1)
=21+0.35
=21.35
解:
6×3.5-1.4×0.5
=21-0.7
=20.3