简便运算:①7×13×(47-213)②125÷(50÷8)③1323-2.25-734④9999×7+1111×37.
简便运算:①7×13×(47-213)②125÷(50÷8)③1323-2.25-734④9999×7+1111×37....
简便运算:①7×13×(47-213)②125÷(50÷8)③1323-2.25-734④9999×7+1111×37.
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①7×13×(
-
),
=7×13×
-7×13×
,
=52-14,
=38;
②125÷(50÷8),
=125÷50×8,
=125×8÷50,
=1000÷50,
=20;
③13
-2.25-7
,
=13
-(2.25+7.75),
=13
-10,
=3
;
④9999×7+1111×37,
=1111×9×7+1111×37,
=1111×63+1111×37,
=1111×(63+37),
=1111×100,
=111100.
4 |
7 |
2 |
13 |
=7×13×
4 |
7 |
2 |
13 |
=52-14,
=38;
②125÷(50÷8),
=125÷50×8,
=125×8÷50,
=1000÷50,
=20;
③13
2 |
3 |
3 |
4 |
=13
2 |
3 |
=13
2 |
3 |
=3
2 |
3 |
④9999×7+1111×37,
=1111×9×7+1111×37,
=1111×63+1111×37,
=1111×(63+37),
=1111×100,
=111100.
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