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c)(145x99+145)-(143x102-143)
= 145x(99+1)-143x(101-1)
= 145x100-143x100
= (145-143)x100
= 2x100
= 200
a,
c1: 2205:245=9
c2: 2205:35:7=9
b,
c1: 3332:196=17
c1: 3332:4:49=17
a) 2205 :(35 x 7)
C1: = 2205:35:7
=63:7
=9
C2: =2205:245
=9
b, 3332:(4x49)
C1:= 3332:196
=17
C2: = 3332:4:49
=833:49
=17
a, 8 x 6/32 x 1/5 = 3/10
8 x 6/32 x 1/5 = 8 x 3/16 x 1/5 = 3/10
b, 15/16 x 36/35 x 28 = 27
Bài 1:
\(\dfrac{2}{3}\) + \(\dfrac{3}{4}\) - \(\dfrac{2}{5}\)
=\(\dfrac{40}{60}\) + \(\dfrac{45}{60}\) - \(\dfrac{24}{60}\)
= \(\dfrac{61}{60}\)
b; \(\dfrac{12}{13}\) x \(\dfrac{3}{4}\) - \(\dfrac{7}{13}\)
= \(\dfrac{9}{13}\) - \(\dfrac{7}{13}\)
= \(\dfrac{2}{13}\)
c; \(\dfrac{15}{17}\) : \(\dfrac{19}{34}\) - \(\dfrac{17}{19}\)
= \(\dfrac{15}{17}\) x \(\dfrac{34}{19}\) - \(\dfrac{17}{19}\)
= \(\dfrac{30}{19}\) - \(\dfrac{17}{19}\)
= \(\dfrac{13}{19}\)
Bài 2:
a; \(\dfrac{x}{5}\) x \(\dfrac{3}{7}\) = \(\dfrac{9}{35}\)
\(\dfrac{x}{5}\) = \(\dfrac{9}{35}\) : \(\dfrac{3}{7}\)
\(\dfrac{x}{5}\) = \(\dfrac{3}{5}\)
\(x\) = \(\dfrac{3}{5}\) x 5
\(x\) = 3
Tính bằng hai cách
a) C1: (12 + 24 + 36) : 6
= (36+36):6
= 72:6
= 12
C2: (12 + 24 + 36) : 6
= 12:6 + 24:6 + 36:6
= 2 + 4 + 6
= 6 + 6 = 12
---
b) C1: 95 : 5 - 35 : 5 - 20 : 5
= 19 - 7 - 4
= 12 - 4
= 8
C2: 95 : 5 - 35 : 5 - 20 : 5
= (95 - 35 - 20) : 5
= (60 - 20) : 5
= 40 : 5 = 8
a) \(\left(12+24+36\right):6\)
C1:
\(\left(12+24+36\right):6\)
\(=72:6\)
\(=12\)
C2:
\(\left(12+24+36\right):6\)
\(=12:6+24:6+36:6\)
\(=2+4+6\)
\(=12\)
b) \(95:5-35:5-20:5\)
C1: \(95:5-35:5-20:5\)
\(=19-7-4=8\)
C2: \(95:5-35:5-20:5\)
\(=\left(95-35-20\right):5\)
\(=40:5=8\)
a) = 13 . (27 + 35 + 38)
= 13 . 80
= 1080
Mk chỉ làm đc câu a thôi!
học tốt ngen!!!
Bài 1: tính nhanh
a) 13 x 27 + 13 x 35 + 13 x 38
= 13 x ( 27 + 35 + 39 )
= 13 x 100
= 1300
P/S: tớ chỉ nhớ mỗi câu a còn câu b tớ quên mất rùi nên vô cung sorry Thư nghen. ^_^
35 + 47 = 82
HT
Tl
A+B=a+b= 35+47= 82
#vohuudoan
ht