题目
递等式计算(能简便的要简便)
(1)
25.3×12﹣33.46÷0.35
(2)
12.74﹣0.125+2.26﹣9.875
(3)
( + )÷
(4)
2.5×13×0.4
(5)
÷[( + )× ]
(6)
+ ×19.
答案: 解:25.3×12﹣33.46÷0.35=303.6﹣95.6=208
解:12.74﹣0.125+2.26﹣9.875=(12.74+2.26)﹣(0.125+9.875)=15﹣10=10
解:( 38 + 56 )÷ 124=( 38 + 56 )×24= 38 ×24+ 56 ×24=9+20=29
解:2.5×13×0.4=2.5×0.4×13=1×13=13
解: 89 ÷[( 25 + 110 )× 34 ]= 89 ÷( 12 × 34 )= 89 ÷ 38= 89×83= 6427
解: 45 + 45 ×19=(1+19)× 45=20× 45=16