tính bằng cách thuận tiện nhất : a,3,25 x7+3,25×2+3,25 b,3,25:0,5+3,25:0,125 c, 62,356:0,125+62,356:0,25-62,356×2 d,(1x2x3x4+…….+2018×2019)x(3,5×6-3,5:0,25-3,5:0,5)
e,(1×1+2×2+…………+2018×2018)x(7,5:0,125-2,5x6x3-7,5:0,5) f,653,6:0,125×5:8 g,12:1,25:8 h,2,5x125x4x8 k,2/5×4/9+2/5×5/9 m,3/4×7/5-2/5×3/4
giải chi tiết hộ em vs ạ
a) 3,25 x 7+3,25x 2+3,25
= 3,25 x ( 7 + 2 )
= 3,25 x 9
= 29,25
b) 3,25:0,5+3,25:0,125
= 3,25 : ( 0,5 + 0 ,125)
=3 ,25 : 0,625
= 5,2
c)62,356 : 0,125 + 62,356 : 0,25 – 62,356 x 2
= 62,356 : 1/8 + 62,356 : 1/4 – 62,356 x 2
= 62,356 x 8 + 62,356 x 4 – 62,356 x 2
= 62,356 x (8 + 4 – 2)
= 62,356 x 10
= 623,56
d )(1x2x3x4+…….+2018×2019) x (3,5 x 6 – 3,5 : 0,25 – 3,5 : 0,5)
= (1x2x3x4+…….+2018×2019) x ( 3,5 x 6 – 3,5 : 1/4 – 3,5 : 1/2)
= (1x2x3x4+…….+2018×2019) x ( 3,5 x 6 – 3,5 x 4 – 3,5 x 2)
= (1x2x3x4+…….+2018×2019) x [3,5 x (6 – 4 – 2)]
= (1x2x3x4+…….+2018×2019) x (3,5 x 0)
= (1x2x3x4+…….+2018×2019) x 0
= 0
e)(1×1+2×2+…………+2018×2018) x (7,5 : 0,125 – 2,5 x 6 x 3 – 7,5 : 0,5)
= (1×1+2×2+…………+2018×2018) x (7,5 : 1/8 – 7,5 x 6 – 7,5 : 1/2)
= (1×1+2×2+…………+2018×2018) x (7,5 x 8 – 7,5 x 6 – 7,5 x 2)
= (1×1+2×2+…………+2018×2018) x [7,5 x (8 – 6 – 2)]
= (1×1+2×2+…………+2018×2018) x (7,5 x 0)
= (1×1+2×2+…………+2018×2018) x 0
= 0
f) 653,6 : 0,125 x 5 : 8
= 653,6 : 1/8 x 5 : 8
= 653,6 x 8 x 5 x 1/8
= 653,6 x 5 x (8 x 1/8)
= 653,6 x 5 x 1
= 3268
g)12 : 1,25 : 8
= 12 : 5/4 : 8
= 12 x 4/5 x 1/8
= 12 x (4/5 x 1/8)
= 12 x 1/10
= 12 : 10
= 1,2
h) 2,5 x 125 x 4 x 8
= (2,5 x 4) x (125 x 8)
= 10 x 1000
= 10000
k) 2/5 x 4/9 + 2/5 x 5/9
= 2/5 x (4/9 + 5/9)
= 2/5 x 1
= 2/5
m) 3/4 x 7/5 – 2/5 x 3/4
= 3/4 x (7/5 – 2/5)
= 3/4 x 1
= 3/4
Mình bổ xung bài rồi đó xin lỗi bạn vỳ hôm trước ko làm hết bài
Đáp án:
Giải thích các bước giải:
a)
3,25 x 7 + 3,25 x 2 + 3,25
= 3,25 x ( 7 + 2 + 1 )
= 3,25 x 10
= 32,5
b)
3,25 : 0,5 + 3,25 : 0,125
= 3,25 : (0,5 + 0,125)
= 3,25 : 0,625
= 5,2
c)
62,356 : 0,125 + 62,356 : 0,25 – 62,356 x 2
= 62,356 : 1/8 + 62,356 : 1/4 – 62,356 x 2
= 62,356 x 8 + 62,356 x 4 – 62,356 x 2
= 62,356 x (8 + 4 – 2)
= 62,356 x 10
= 623,56
d)
(1x2x3x4+…….+2018×2019) x (3,5 x 6 – 3,5 : 0,25 – 3,5 : 0,5)
= (1x2x3x4+…….+2018×2019) x ( 3,5 x 6 – 3,5 : 1/4 – 3,5 : 1/2)
= (1x2x3x4+…….+2018×2019) x ( 3,5 x 6 – 3,5 x 4 – 3,5 x 2)
= (1x2x3x4+…….+2018×2019) x [3,5 x (6 – 4 – 2)]
= (1x2x3x4+…….+2018×2019) x (3,5 x 0)
= (1x2x3x4+…….+2018×2019) x 0
= 0
e)
(1×1+2×2+…………+2018×2018) x (7,5 : 0,125 – 2,5 x 6 x 3 – 7,5 : 0,5)
= (1×1+2×2+…………+2018×2018) x (7,5 : 1/8 – 7,5 x 6 – 7,5 : 1/2)
= (1×1+2×2+…………+2018×2018) x (7,5 x 8 – 7,5 x 6 – 7,5 x 2)
= (1×1+2×2+…………+2018×2018) x [7,5 x (8 – 6 – 2)]
= (1×1+2×2+…………+2018×2018) x (7,5 x 0)
= (1×1+2×2+…………+2018×2018) x 0
= 0
f)
653,6 : 0,125 x 5 : 8
= 653,6 : 1/8 x 5 : 8
= 653,6 x 8 x 5 x 1/8
= 653,6 x 5 x (8 x 1/8)
= 653,6 x 5 x 1
= 3268
g)
12 : 1,25 : 8
= 12 : 5/4 : 8
= 12 x 4/5 x 1/8
= 12 x (4/5 x 1/8)
= 12 x 1/10
= 12 : 10
= 1,2
h)
2,5 x 125 x 4 x 8
= (2,5 x 4) x (125 x 8)
= 10 x 1000
= 10000
k)
2/5 x 4/9 + 2/5 x 5/9
= 2/5 x (4/9 + 5/9)
= 2/5 x 1
= 2/5
m)
3/4 x 7/5 – 2/5 x 3/4
= 3/4 x (7/5 – 2/5)
= 3/4 x 1
= 3/4