能简便计算的简便计算 就4道!(5)[(13 +25 )÷2]×511 (6)735+24×207(7)0.234÷(0.9-0.25) (8)37.5×2.5+2.5×2.5

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能简便计算的简便计算 就4道!
(5)[(13 +25 )÷2]×511 (6)735+24×207
(7)0.234÷(0.9-0.25) (8)37.5×2.5+2.5×2.5

(5)[(13 +25 )÷2]×511
=38÷2×511
=19×511
=9709
(6)735+24×207
=735+4968
=5703
(7)0.234÷(0.9-0.25)
=0.234÷0.65
=0.36
(8)37.5×2.5+2.5×2.5
=2.5×(37.5+2.5)
=2.5×40
=25×4
=100

(5)原式=(38÷2)×511
=19×511
=9709
(6)原式=735+4968
=5703
(7)原式=0.234÷0.65
=0.36
(8)原式=2.5×(37.5+2.5)
=2.5×40
=100