bài 1 tính nhanh
a.5/12+7/12+4/7=
b.7/8×8/27×4/7=
c.12/15×3/5×20/18=
bài 1 tính nhanh a.5/12+7/12+4/7= b.7/8×8/27×4/7= c.12/15×3/5×20/18=
By Jasmine
By Jasmine
bài 1 tính nhanh
a.5/12+7/12+4/7=
b.7/8×8/27×4/7=
c.12/15×3/5×20/18=
msc=84
a,5/12+7/12+4/7
=35+49+28/84=112/84=4/3
b,.7/8×8/27×4/7=7x8x4/7x8x27=4/27
c,12/15×3/5×20/18=12x3x20/15x5x18=7200/1350=8/15chúc bn hok tốt
Em tham khảo nhé :
Bài 1. Tính nhanh :
a. 5/12 + 7/12 + 4/7
= ( 5/12 + 7/12 ) + 4/7
= 1 + 4/7
= 11/7
b. 7/8 × 8/27 × 4/7
= ( 7/8 × 4/7 ) × 8/27
= 1/2 × 8/27
= 4/27
c. 12/15 × 3/5 × 20/18
= 4/5 × ( 3/5 × 20/18 )
= 4/5 × 2/3
= 8/15
Chúc em học tốt !