递等式计算.(能巧算的要巧算)(1)(80-4)×125 (2)(29+29+29+49)×250 (3)96×(718-94)
递等式计算.(能巧算的要巧算)(1)(80-4)×125(2)(29+29+29+49)×250(3)96×(718-94)(4)32×88-23×88+88(5)124...
递等式计算.(能巧算的要巧算)(1)(80-4)×125 (2)(29+29+29+49)×250 (3)96×(718-94) (4)32×88-23×88+88 (5)124×25 (6)125×12×25 (7)[332-(32+278)]×186 (8)29+39+49= (9)1726+926-38= (10)1-57-27=
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(1)(80-4)×125,
=80×125-4×125,
=10000-500,
=9500;
(2)(29+29+29+49)×250,
=136×250,
=(100+36)×250,
=100×250+9×4×250,
=25000+9000,
=34000;
(3)96×(718-94),
=96×624,
=59904;
(4)32×88-23×88+88,
=(32-23+1)×88,
=10×88,
=880;
(5)124×25,
=(100+20+4)×25,
=100×25+20×25+4×25,
=2500+500+100,
=3100;
(6)125×12×25,
=125×3×4×25,
=(125×3)×(4×25),
=375×100,
=37500;
(7)[332-(32+278)]×186,
=(332-32-278)×186,
=22×186,
=4092;
(8)
+
+
=1;
(9)
+
-
,
=1-
,
=
;
(10)1-
-
,
=1-((
+
),
=1-1,
=0.
=80×125-4×125,
=10000-500,
=9500;
(2)(29+29+29+49)×250,
=136×250,
=(100+36)×250,
=100×250+9×4×250,
=25000+9000,
=34000;
(3)96×(718-94),
=96×624,
=59904;
(4)32×88-23×88+88,
=(32-23+1)×88,
=10×88,
=880;
(5)124×25,
=(100+20+4)×25,
=100×25+20×25+4×25,
=2500+500+100,
=3100;
(6)125×12×25,
=125×3×4×25,
=(125×3)×(4×25),
=375×100,
=37500;
(7)[332-(32+278)]×186,
=(332-32-278)×186,
=22×186,
=4092;
(8)
2 |
9 |
3 |
9 |
4 |
9 |
(9)
17 |
26 |
9 |
26 |
3 |
8 |
=1-
3 |
8 |
=
5 |
8 |
(10)1-
5 |
7 |
2 |
7 |
=1-((
5 |
7 |
2 |
7 |
=1-1,
=0.
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