问题
计算题
脱式计算。(能简算的要简算)
|
答案
(1)( 9.25+ 0.3×33-1.99)÷2.5 | |
=(9.25+9.9-1.99)÷2.5 | |
=17.16÷2.5 | |
=6.864 | (2)(5.7×1.2+1.2×4.3)×2.5 |
=(5.7+4.3)×1.2×2.5 | |
=10×1.2×2.5 | |
=30 | |
(3)(2.87×9.4-9.4×1.87)×0.13 | |
=(2.87-1.87)×9.4×0.13 | |
=1×9.4×0.13 | |
=1.222 | (4)[2.9-1.8÷( 4.8-3.9)]×3 |
=[2.9-1.8÷0.9]×3
= ( 2.9-2)×3
= 2.7