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用简便方法计算:0.125×0.25×8×47.4×0.28+0.28×2.615.89-3.2-6.8.

题目详情
用简便方法计算:
0.125×0.25×8×4     
7.4×0.28+0.28×2.6     
15.89-3.2-6.8.
▼优质解答
答案和解析
0.125×0.25×8×4,
=(0.125×8)×(0.25×4),
=1×1,
=1;
7.4×0.28+0.28×2.6,
=(7.4+2.6)×0.28,
=10×0.28,
=2.8;
15.89-3.2-6.8,
=15.89-(3.2+6.8),
=15.89-10,
=5.89.