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2.25÷7.5x(3.2÷2.5)脱式计算简便

1。 7.5X(3/5)+2.5除以(5/3) =7.5X(3/5)+2.5X(3/5) =(7.5+2.5)X(3/5) =10X(3/5) =6. 2。 (2/9)除以[(5/6)X(4/5-2/3)] 解: 因为 [(5/6)X(4/5-2/3)]除以(2/9) =[(5/6)X(4/5-2/3)]X(9/2) =(9/2)X(5/6)X(4/5)-(9/2)X(5/6)X(2/3) =3-5/2 =1/2 所以 (...

7.5÷x=2.5÷12 7.5÷x=2.5/12 x=7.5÷2.5/12 x=7.5*12/2.5=3*12=36

答案是(1)x÷7.5=2.5 因为题目中是7.5“除”x,请注意:在除法中,“除以”和“除”是不同的,“除以”是先读被除数,也就是被除数除以除数等于商,而“除”则是先读除数,即除数除被除数等于商。 如本例:x÷7.5=2.5,可以读作x除以7.5等于2.5;也可以读...

原式 =(7.5x6.9)÷(2.5x2.3) =7.5x6.9÷2.5÷2.3 =(7.5÷2.5)x(6.9÷2.3) =3x3 =9 供参考。

(4.8×7.5×8.1)÷(2.4×2.5×2.7) =(4.8÷2.4)×(7.5÷2.5)×(8.1÷2.7) =2×3×3 =18

2.5÷x=7.5 x=2.5÷7.5 =1/3

(1)2.5x+1.2×4=14.8, 2.5x+4.8=14.8, 2.5x+4.8-4.8=14.8-4.8, 2.5x=10, 2.5x÷2.5=10÷2.5, x=4;(2)5x+2.5x=20, 7.5x=20, 7.5x÷7.5=20÷7.5, x= 2 2 3 ;(3)(4.5+x)×0.04=1.6,(4.5+x)×0.04÷0.04=1.6÷0.04, 4.5+x=40, 4.5+x-...

408-12×24 = 408 - 288 = 120 (46+28)×60 = 74 x 60 = 4440 42×50-17 = 2100- 17 = 2083 32+105÷5 = 32 + 21 = 53 420×(327-238) = 420 x 89 = 37380 (4121+2389)÷7 = 6510 ÷7 = 930 3.416÷(0.016×35) = 3.416 ÷0.56 = 6.1 0.8×[(10...

1)x=18 2)x=7.5 3)x=2.5 4)x=9.8 5)x=17.4

10x-7.5x=5 解:(10-7.5)x=5 2.5x=5 2.5x÷2.5=5÷2.5 x=2

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