题目

脱式计算,能简便的要简便. ① ÷ × ② ③( ) ④ + + ⑤ ⑥7×9×( ) 答案:① 1112 ÷ 229 × 78 = 38 × 78 = 2164 ② 813:7+17×513 = 813 × 17 + 17 × 513 =( 813 + 513 )× 17 =1× 17 = 17 ③( 78−23 ) ÷524 = 524 ÷524 =1 ④ 17 + 57÷56 + 512 = 17 + 67 + 512 =1+ 512 =1 512 ⑤ 35÷(310+58) = 35 ÷ 3740 = 2437 ⑥7×9×( 59−37 ) =7×9× 59 ﹣7×9× 37 =35﹣27 =8
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