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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
(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.