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简算①925-(337+0.4)②1.8×14+2.2×25%③11×3+13×5+15×7+…+117×19+119×21.
题目详情
简算 ①9
②1.8×
③
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▼优质解答
答案和解析
①9
=9
=9
=9-3
=5
②1.8×
=1.8×0.25+2.2×0.25, =(1.8+2.2)×0.25, =4×0.25, =1; ③
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