题目
脱式计算(能简算的要简算)15×( + ) × + × ( ﹣ )× ÷ ( + )×325÷[( + )× ]48×( +2)÷
答案:解:①15×( 23 + 35 ) =15× 23 +15× 35 =10+9=19② 13 × 12 + 12 × 23 = 12 ×( 13 + 23 )= 12 ×1= 12 ③( 12 ﹣ 16 )× 35 ÷ 15 = 13 × 35 ÷ 15 = 15 ÷ 15 =1④( 34 + 58 )×32= 34 ×32+ 58 ×32=24+20=44⑤5÷[( 23 + 15 )× 113 ]=5÷[ 1315 × 113 ]=5÷ 115 =75⑥48×( 712 +2)÷ 23 =48× 3112 × 32 =124× 32 =186