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3.5×0.7-1.2×0.5
=(0.5×7)×0.7-1.2×0.5
=0.5×(7×0.7-1.2)
=0.5×(4.9-1.2)
=0.5×3.7
=1.85
=(0.5×7)×0.7-1.2×0.5
=0.5×(7×0.7-1.2)
=0.5×(4.9-1.2)
=0.5×3.7
=1.85
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展开全部
1.85
解析:
3.5×0.7-1.2×0.5
=3.5×(0.6+0.1)-0.6
=3.5×0.6+3.5×0.1-0.6
=2.1+0.35-0.6
=(2.1-0.6)+0.35
=1.5+0.35
=1.85
解析:
3.5×0.7-1.2×0.5
=3.5×(0.6+0.1)-0.6
=3.5×0.6+3.5×0.1-0.6
=2.1+0.35-0.6
=(2.1-0.6)+0.35
=1.5+0.35
=1.85
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