问题
解答题
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答案
①35.2×45.6+45.6×63.8+45.6
=(35.2+63.8+1)×45.6
=100×45.6
=4560;
②(5.6×3.6×4)÷(1.8×2.8×2)
=(5.6÷2.8)×(3.6÷1.8)×(4÷2)
=2×2×2
=8;
③0.83×0.68+11.7×0.068
=0.83×0.68+1.17×0.68
=(0.83+0.17)×0.68
=1×0.68
=0.68;
④(12.8+12.8+12.8+12.8)×2.5
=12.8×4×2.5
=12.8×(4×2.5)
=12.8×10
=128.