用最喜欢的方法计算 12.5×38×0.8 (8.5-4)×(0.32÷1.6) 6.5×4.6+6.5×15.4 9 8 ÷[ 3 4 ÷(1- 1 8 ) ].
第1个回答 2019-09-23
(1)12.5×38×0.8, =(12.5×0.8)×38, =10×38, =380; (2)(8.5-4)×(0.32÷1.6), =4.5×0.2, =0.9; (3)6.5×4.6+6.5×15.4, =6.5×(4.6+15.4), =6.5×20, =130; (4) 9 8 ÷[ 3 4 ÷(1- 1 8 )], = 9 8 ÷[ 3 4 ÷ 7 8 ], = 9 8 ÷[ 3 4 × 8 7 ], = 9 8 ÷ 6 7 , = 9 8 × 7 6 , = 21 16 .