
简便运算.7.5+2.7+2.7+2.5+4.3 7.9-3.27-0.73+1.1 &nbs...
简便运算.7.5+2.7+2.7+2.5+4.37.9-3.27-0.73+1.172×125(80+4)×12567×88+67×11+67203×15....
简便运算.7.5+2.7+2.7+2.5+4.3 7.9-3.27-0.73+1.1 72×125 (80+4)×125 67×88+67×11+67 203×15.
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(1)7.5+2.7+2.7+2.5+4.3
=(7.5+2.5)+(2.7+4.3)+2.7,
=10+7+2.7,
=19.7;
(2)7.9-3.27-0.73+1.1
=7.9+1.1-(3.27+0.73),
=9-4,
=5;
(3)72×125
=9×8×125,
=9×(8×125),
=9×1000,
=9000;
(4)(80+4)×125
=80×125+4×125,
=10000+500,
=10500;
(5)67×88+67×11+67
=(88+11+1)×67,
=100×67,
=6700.
(6)203×15
=(200+3)×15,
=200×15+3×15,
=3000+45,
=3045.
=(7.5+2.5)+(2.7+4.3)+2.7,
=10+7+2.7,
=19.7;
(2)7.9-3.27-0.73+1.1
=7.9+1.1-(3.27+0.73),
=9-4,
=5;
(3)72×125
=9×8×125,
=9×(8×125),
=9×1000,
=9000;
(4)(80+4)×125
=80×125+4×125,
=10000+500,
=10500;
(5)67×88+67×11+67
=(88+11+1)×67,
=100×67,
=6700.
(6)203×15
=(200+3)×15,
=200×15+3×15,
=3000+45,
=3045.
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