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用简便方法,112x12一112x2(3.75+4.1+2.35)x9用简便方法,112x12一112x2(3.75+4.1+2.35)x9.8

题目详情
用简便方法,112x12一112x2 (3.75+4.1+2.35)x9
用简便方法,112x12一112x2 (3.75+4.1+2.35)x9.8
▼优质解答
答案和解析
112x12-112x2
=112x(12-2)
=112x10
=1120
(3.75+4.1+2.35)x9.8 (3.75+4.1+2.35)x9.8
=10.2x9.8 或=(10+0.2)x(10-0.2)
=10.2x(10-0.2) =10x10-0.2x0.2
=10.2x10-10.2x0.2 =100-0.04
=102-2.04 =99.96
=99.96