用递等式计算.①987+104×65-1747② 37 63 ÷7+ 1 7 × 26 63 ③(
用递等式计算.①987+104×65-1747②3763÷7+17×2663③(79+421-37)×6.3④15÷〔(57-12)÷328〕-0.5....
用递等式计算.①987+104×65-1747② 37 63 ÷7+ 1 7 × 26 63 ③( 7 9 + 4 21 - 3 7 )×6.3④15÷〔( 5 7 - 1 2 )÷ 3 28 〕-0.5.
展开
①987+104×65-1747, =(1000-13)+(100+4)×65-1747, =1000-13+6500+260-1747, =1000-13+6500+200+60-1700-47, =(1000+6500+200-1700)+(60-13-47), =6000+0, =6000;
② ÷7+ × = × + × , =( + )× , =1× , = ;
③( + - )×6.3, = ×6.3+ ×6.3- ×6.3, =4.9+1.2-2.7, =3.4;
④15÷[( - )÷ ]-0.5, =15÷[ × ]-0.5, =15÷2-0.5, =7.5-0.5, =7. |
收起
为你推荐: