能简算的要简算.2.4+12.7+47.6+37.3 &nbs
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能简算的要简算. 2.4+12.7+47.6+37.3 | 15×21+15×78+15 | 63×99 |
29×47-47×19. | 32×125×25 | 4200÷25÷4 |
17×(106-312÷13)136÷17-0.32×10. |
![能简算的要简算.2.4+12.7+47.6+37.3 &nbs](/uploads/image/z/2249600-32-0.jpg?t=%E8%83%BD%E7%AE%80%E7%AE%97%E7%9A%84%E8%A6%81%E7%AE%80%E7%AE%97%EF%BC%8E2.4%2B12.7%2B47.6%2B37.3%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbs)
(1)2.4+12.7+47.6+37.3
=2.4+47.6+(37.3+12.7)
=50+50
=100;
(2)15×21+15×78+15
=15×(21+78+1)
=15×100
=1500;
(3)63×99
=63×100-63×1
=6300-63
=6237;
(4)29×47-47×19
=(29-19)×47
=10×47
=470;
(5)32×125×25
=8×125×(4×25)
=1000×100
=100000;
(6)4200÷25÷4
=4200÷(25×4)
=4200÷100
=42;
(7)17×(106-312÷13)
=17×(106-24)
=17×82
=1394;
(8)136÷17-0.32×10
=8-3.2
=4.8.
=2.4+47.6+(37.3+12.7)
=50+50
=100;
(2)15×21+15×78+15
=15×(21+78+1)
=15×100
=1500;
(3)63×99
=63×100-63×1
=6300-63
=6237;
(4)29×47-47×19
=(29-19)×47
=10×47
=470;
(5)32×125×25
=8×125×(4×25)
=1000×100
=100000;
(6)4200÷25÷4
=4200÷(25×4)
=4200÷100
=42;
(7)17×(106-312÷13)
=17×(106-24)
=17×82
=1394;
(8)136÷17-0.32×10
=8-3.2
=4.8.