a) 34.15 + 34.85 = 34.(15+85) = 34.100 = 3400
b) 12.57 + 57.25 + 63.57 = 57.(12+25+63) = 57.100 = 5700
c) 36.28 + 36.82 + 64.69 + 64.41 = 36.(28+82) + 64(69+41) = 36.110 + 64.110 = 110.(36+64) = 11000
d) 2.31.12 + 4.6.42 + 8.27.3 = 24.31 + 24.42 + 24.27 = 24.(31+42+27) = 24.100 = 2400
tính nhanh:
a) 34 . 15 + 34 . 85
b) 12 . 57 + 57 . 25 + 63 . 57
c) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
d) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3
tính nhanh:a)2.31.12+4.6.42+8.27.3
b)36.28+36.82+64.69+64.41
c)99-97+95-93+91-89+..............+7-5+3-1
Mong mọi người giúp đỡ ạ!!!
Tính nhanh:a)2.31.12+4.6.42+8.27.3 ; b)36.28+36.82+64.69+64.41
Tính nhanh:
a)2.31.12+4.6.42+8.27.3
b)36.28+36.82+64.69+64.41
Tính nhanh
a:2.31.12+4.6.42+8.27.3
b:36.28+36.82+64.69+64.41
a)2.31.12+4.6.42+8.27.3
b)36.28+36.82+64.69+64.41
a) 2.31.12+4.6.42+8.27.3
b)36.28+36.82+64.69+64.41
Tính nhanh :
a) 2.31.12+4.6.42+8.27.3
b)36.28+36.82+64.69+64.41
tinh nhanh
a) 2.31.12+4.6.42+8.27.3
b) 36.28+36.82+64.69+64.41
