(-5)×2/13×(-5)
问题描述:
(-5)×2/13×(-5)
2.(-7又3/8)×(-0.5)×(-2)
3. -12×(1/3-1/4)
4. 3又7/8×(-2又3/5)-2又7/8×(-2又3/5)
5 . 5/11×(-2/9)×(-2又1/5)×(-4又1/2)约分简便运算:
6. 1.25×(-1又1/7)×(-3.2)×(-7/8)分数、小数互化
7. (-1/6-3/20+4/5-7/12)×(-15×4)乘法分配律
8. 4/5×(-5/13)-(-3/5)×(-5/13)-5/13×(-1又3/5)乘法分配律逆向应用
9.(-99又22/33)×(+69)拆项后用乘法分配律(提示:把-99又22/33拆成(1/23-100))
答
(-5)×2/13 ×(-5)=5×2/13 ×5=50/13(-7又3/8)×(-0.5)×(-2)=-(7又3/8×0.5×2)=-7又3/8-12×(1/3-1/4)=-12×1/3+12×1/4=-4+3=-13又7/8×(-2又3/5)-2又7/8×(-2又3/5)=(-2又3/5)×(3又7/8-2又7/8)=-2又3/55/11×(...