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计算下面各题,能简算的要简算.0.89×100.172×0.82+2.8×8.21.3×5.8+4.2(45.9-32.7)÷8÷0.125.

题目详情
计算下面各题,能简算的要简算.
0.89×100.1
72×0.82+2.8×8.2
1.3×5.8+4.2
(45.9-32.7)÷8÷0.125.
▼优质解答
答案和解析
(1)0.89×100.1
=0.89×(100+0.1)
=0.89×100+0.89×0.1
=89+0.089
=89.089

(2)72×0.82+2.8×8.2
=7.2×8.2+2.8×8.2
=8.2×(7.2+2.8)
=8.2×10
=82

(3)1.3×5.8+4.2
=7.54+4.2
=11.74

(4)(45.9-32.7)÷8÷0.125
=13.2÷(8×0.125)
=13.2÷1
=13.2