用简便方法计算下列各题,我很急,在线等,谢谢!
问题描述：
用简便方法计算下列各题,我很急,在线等,谢谢!
1.8×19.2-3.6×4.6
3.2×1.85+1.6×16.3
6.38×9.9+33×3.62×0.3
答
1.8×19.2-3.6×4.6=1.8x19.2-1.8x2x4.6=1.8x(19.2-9.2)=1.8x10=183.2×1.85+1.6×16.3=1.6x2x1.85+1.6x16.3=1.6x(3.7+16.3)=1.6x20=326.38×9.9+33×3.62×0.3=6.38x9.9+9.9x3.62=9.9x(6.38+3.62)=9.9x10=99