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<p><img src='https://t1.daumcdn.net/cafeattach/1XCRg/264ffc5889b6203cbfe6ad280085fac7c39140ef' class="txc-image" /></p><p><img src='https://t1.daumcdn.net/cafeattach/1XCRg/a46c3051a0ebd1d4f9ff2e2aad1410003b0db2b4' class="txc-image" /></p><p class="cafe-editor-text">(2) 계단 연기감지기 수량이 왜 4개죠?</p>
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첫댓글 3.6×7÷15=1.68=2 계단2개소=4개