问题
填空题
7.2×1.69+3.14×2.8+1.45×7.2=______.
答案
7.2×1.69+3.14×2.8+1.45×7.2
=(1.69+1.45)×7.2+3.14×2.8,
=3.14×7.2+3.14×2.8,
=(7.2+2.8)×3.14,
=10×3.14,
=31.4.
故答案为:31.4.
7.2×1.69+3.14×2.8+1.45×7.2=______.
7.2×1.69+3.14×2.8+1.45×7.2
=(1.69+1.45)×7.2+3.14×2.8,
=3.14×7.2+3.14×2.8,
=(7.2+2.8)×3.14,
=10×3.14,
=31.4.
故答案为:31.4.