12÷(3/7+6/5)脱式计算能简算的要简算
脱式计算,能简算的要简算.(1)8.4×110+1.6÷10(2)37÷56+47×65(3)(117+14)×4+317(4)12.5-(8.5+0.625÷62.5%...
脱式计算,能简算的要简算. (1)8.4× 1 10 +1.6÷10 (2) 3 7 ÷ 5 6 + 4 7 × 6 5 (3)( 1 17 + 1 4 )×4+ 3 17 (4)12.5-(8.5+0.625÷62.5%)
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(1)8.4× 1 10 +1.6÷10 =8.4× 1 10 +1.6× 1 10 , =(8.4+1.6)× 1 10 , =10× 1 10 , =1; (2) 3 7 ÷ 5 6 + 4 7 × 6 5 = 3 7 × 6 5 + 4 7 × 6 5 , =( 3 7 + 4 7 )× 6 5 , =1× 6 5 , = 6 5 . (3)( 1 17 + 1 4 )×4+ 3 17 = 1 17 ×4+ 1 4 ×4+ 3 17 , = 4 17 + 3 17 +1, =1 7 17 ; (4)12.5-(8.5+0.625÷62.5%) =12.5-(8.5+1), =12.5-9.5, =3.
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