6.5×0.38+0.65x4.7+0.065x15简算?
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6.5×0.38+0.65x4.7+0.065x15
这里6.5和后面的0.65,0.065是很有规律的,可以把0.65看成6.5x0.1,0.065=6.5x0.01
这样就可以找到公因数,用乘法分配律简算。
6.5×0.38+0.65x4.7+0.065x15
=6.5x0.38+6.5x0.1x4.7+6.5x0.01x15
=6.5x0.38+6.5x0.47+6.5x0.15
=6.5x(0.38+0.47+0.15)
=6.5x1
=6.5
这里6.5和后面的0.65,0.065是很有规律的,可以把0.65看成6.5x0.1,0.065=6.5x0.01
这样就可以找到公因数,用乘法分配律简算。
6.5×0.38+0.65x4.7+0.065x15
=6.5x0.38+6.5x0.1x4.7+6.5x0.01x15
=6.5x0.38+6.5x0.47+6.5x0.15
=6.5x(0.38+0.47+0.15)
=6.5x1
=6.5
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