7.5×0.28+8.2×0.75-7.5怎么简便计算谢谢了谢谢了
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解:7.5×0.28+8.2×0.75-7.5等于( 3/4 ),【即等于0.75】
∵已知需求出7.5×0.28+8.2×0.75-7.5等于多少
∴7.5 × 0.28 + 8.2 × 0.75 - 7.5
= 7.5 × 0.28 + 8.2/10 × (0.75×10) - 7.5
= 7.5 × 0.28 + 0.82 × 7.5 - 7.5
= 7.5 × (0.28 + 0.82 - 1)
= (7×10+5)/10 × (1.1 - 1)
= 75/10 × 0.1
= 15/2 × 1/10
= 3/4
= 0.75
答:7.5×0.28+8.2×0.75-7.5等于3/4,【即等于0.75】
∵已知需求出7.5×0.28+8.2×0.75-7.5等于多少
∴7.5 × 0.28 + 8.2 × 0.75 - 7.5
= 7.5 × 0.28 + 8.2/10 × (0.75×10) - 7.5
= 7.5 × 0.28 + 0.82 × 7.5 - 7.5
= 7.5 × (0.28 + 0.82 - 1)
= (7×10+5)/10 × (1.1 - 1)
= 75/10 × 0.1
= 15/2 × 1/10
= 3/4
= 0.75
答:7.5×0.28+8.2×0.75-7.5等于3/4,【即等于0.75】
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这道题的式子可以进行一下化简
七点5×0点28+7点5×0点82-7点5=7点5×0=0
七点5×0点28+7点5×0点82-7点5=7点5×0=0
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7.5×0.28+8.2×0.75-7.5
=7.5×0.28+0.82×10x0.75-7.5
=7.5×0.28+0.82×7.5-7.5
=7.5x(0.28+0.82-1)
=7.5x0.1
=0.75
=7.5×0.28+0.82×10x0.75-7.5
=7.5×0.28+0.82×7.5-7.5
=7.5x(0.28+0.82-1)
=7.5x0.1
=0.75
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