谁会解这个数学题

2025-12-13 23:16:45
推荐回答(2个)
回答1:

我来帮你:
2、用递等式计算。(每题2.5分,共10分)
① 987+104×65-1747 ② 3763 ÷7 +17 ×2663
=987+6760-1747 =537又7分之4+17×2663
=7747-1747 = 537又7分之4+45271
=6000 =45808又7分之4

③ ( 79 +421 -37 )×6.3 ④ 15÷〔( 57 -12 )÷328 〕-0.5
=(500-37)×6.3 =15÷〔45÷328 〕-0.5
=463×6.3 =15×328÷45-0.5
=2916.9 =4920÷45-0.5
=4905又3分之1-0.5
=4904又6分之5
3、求未知数X。(每题2分,共6分)
0.4 X-0.4×10.8 =20 13 X+34 X =1348 56 : X = 34 : 25
0.4 X=20+4.32 47X=1348 34×X=56×25
X=60.8 X=28又47分之32 X=41又17分之3

回答2:

① 987+104×65-1747 ② 3763 ÷7 +17 ×2663
=987+6760-1747 =537又7分之4+17×2663
=7747-1747 = 537又7分之4+45271
=6000 =45808又7分之4

③ ( 79 +421 -37 )×6.3 ④ 15÷〔( 57 -12 )÷328 〕-0.5
=(500-37)×6.3 =15÷〔45÷328 〕-0.5
=463×6.3 =15×328÷45-0.5
=2916.9 =4920÷45-0.5
=4905又3分之1-0.5
=4904又6分之5
3、求未知数X。(每题2分,共6分)
0.4 X-0.4×10.8 =20 13 X+34 X =1348 56 : X = 34 : 25
0.4 X=20+4.32 47X=1348 34×X=56×25
X=60.8 X=28又47分之32 X=41又17分之3