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This problem is calculated using the associative law of multiplication, which is very simple.
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It is easier to use the multiplicative distributive property twice.
Original = (14+
14x7+
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One-two (one.
II 7 II 7x (15a.
II. 7 15 15 7 II 105 12.
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It can be calculated like this, the easiest way is the original =(
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=(=To explain: In the end, it is still necessary to form, because the premise of simplicity is that only oral arithmetic is required as much as possible.
Above, for reference. Thank you!
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You can calculate first, then , preceded equals, then multiplied, and the final result is equal to.
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With the commutative law of multiplication, the process is as follows.
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Solution: Original form.
One method: use the multiplicative distributive property to achieve simple calculations.
The formula is: axb-axc=ax(b-c).
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Original = shrink tenfold, expand tenfold, product unchanged,
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Simple basis: multiplicative distributive law.
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You use the following to have **, you take a look.
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Easy method, seemingly impossible to apply multiplicative distributive property.
The inverse of the operation, but careful analysis but careful analysis found that the expansion was ten times, and the 51 was reduced tenfold, which was unchanged. Transform the original formula to, and you will find that this can be used as the inverse of the multiplicative distributive property, (.
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In this problem, multiplying by 2 with the property of product invariance becomes that the product is invariant, then the other multiplier is divided by 2, and the product is unchanged. At this time, the multiplier becomes a sum, and the product can be calculated. Thank you!
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+ Calendar shed extract potato rotten scattered 666] number.
666x(666x10
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Summary. Dear, the answer is:
The easy way?
Kiss, the answer is: seep Zheng Ji Cong socks blind
Divide by 2.
Kiss, yes.
Is that so? Kiss, because you can
Don't you need parentheses at the end.
Dear, this is not needed.
Dear, the answer is:
That's it.
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It's easy. You turn the equation into.
Math Easy Calculation Method:
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1. Apply the multiplicative distributive law.
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