Question

2) Tính nhanh:

a) (-3,37 : 0,4) . 2,5

b) (-0,125) . (-5,3) . 8

c) (-2,5) . (-4) . (-7,9)

d) (-0,375) . \(4\frac{1}{3}\) . (-2)\(^3\)

Answer 1

a) \(=\left(\frac{-337}{100}:\frac{40}{100}\right).\frac{250}{100}=\frac{-337}{40}.\frac{40}{16}=-\frac{337}{16}\)

b) \(=\frac{-1}{8}.\left(-5,3\right).8=\frac{-1}{8}.8.\left(-5,3\right)=-1.\left(-5,3\right)=5,3\)

c) \(=10.\left(-7,9\right)=-79\)

d) \(=-\frac{3}{8}.\frac{13}{3}.\left(-8\right)=\left[-\frac{3}{8}.\left(-8\right)\right].\frac{13}{3}=3.\frac{13}{3}=13\)

Answer 2

a)(-3,37:0,4).2,5

=(-8,425).2,5

=-21,0625

b) (-0,125) . (-5,3) . 8

=(-0,125).8.(-5,3)

=(-1).(-5,3)

=5,3

c)(-2,5).(-4).(-7,9)

=10.(-7,9)

=-79

d)(-0,375).\(4\frac{1}{3}\).(-2)³

=(-0,375).(-2)³.\(4\frac{1}{3}\)

=3.\(\frac{13}{3}\)

=13