0.28*0.45+1.85 简便计算
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这个题目应该不可以简便计算,是不是这样的哦:
0.28×0.45+1.8
=0.07×4×0.45+1.8
=0.07×(4×0.45)+1.8
=0.07×1.8+1.8
=0.07×1.8+1.8×1
=1.8×(0.07+1)
=1.8×1.07
=1.926
如果一定要用简便方法,可以这样:
0.28×0.45+1.85
=0.7×0.4×0.45+1.85
=0.7×(0.4×0.45)+1.85
=0.7×0.18+1.85
=0.126+1.85
=1.976
0.28×0.45+1.8
=0.07×4×0.45+1.8
=0.07×(4×0.45)+1.8
=0.07×1.8+1.8
=0.07×1.8+1.8×1
=1.8×(0.07+1)
=1.8×1.07
=1.926
如果一定要用简便方法,可以这样:
0.28×0.45+1.85
=0.7×0.4×0.45+1.85
=0.7×(0.4×0.45)+1.85
=0.7×0.18+1.85
=0.126+1.85
=1.976
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