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a. ….= 61 692 : 4 = 15 423
….= 33 164 : 4 + 28 528 : 4
….= 8291 + 7132 = 15 423
b. ….= 387 079 : 7 = 55 297
….= 403 494 : 7 – 16 414 : 7
….= 57 642 - 2345 = 55 297
415 x 42 + 415 x 33 + 415 x 25
= 415 x ( 42 + 33 + 25)
= 415 x 100
= 41500
Cách 1:
\(\dfrac{3}{7}\) x \(\dfrac{16}{33}\) + \(\dfrac{16}{33}\) x \(\dfrac{4}{7}\)
= \(\dfrac{48}{231}\) + \(\dfrac{64}{231}\)
= \(\dfrac{112}{231}\)
= \(\dfrac{16}{33}\)
cách 2: \(\dfrac{3}{7}\) x \(\dfrac{16}{33}\) + \(\dfrac{16}{33}\) x \(\dfrac{4}{7}\)
= \(\dfrac{16}{33}\) x ( \(\dfrac{3}{7}\) + \(\dfrac{4}{7}\))
= \(\dfrac{16}{33}\) x \(\dfrac{7}{7}\)
= \(\dfrac{16}{33}\)
Cách 1: (Tính bình thường)
= 16/77 + 64/231 (Quy đồng đi nha, mẫu chung là 231)
= 16/33
Cách 2: (Tính nhanh)
= 16/33 x ( 3/7 + 4/7 )
= 16/33 x 1
= 16/33
a,=(25.4).(125.8)
=100.1000
=100000
b,=789.10=7890
c,123.(125-24-30)
=123.71
=8733
d,=415.(98+1+1)
=415.10
=4150
\(\frac{3}{7}x\frac{16}{33}+\frac{16}{33}x\frac{4}{7}\)
\(C1:=\frac{16}{77}+\frac{64}{231}=\frac{16}{33}\)
\(C2:=\frac{16}{33}\left(\frac{3}{7}+\frac{4}{7}\right)=\frac{16}{33}.1=\frac{16}{33}\)
học tốt ~~~
C1:3/7×16/33+16/33×4/7
=48/231+64/231
=112/231
C2:3/7×16/33+16/33×4/7
=16/33×(3/7+4/7)
=16/33×7/7
=113/231
\(\dfrac{2021}{2022}.\dfrac{7}{16}+\dfrac{9}{16}.\dfrac{2021}{2022}=\dfrac{2021}{2022}\left(\dfrac{7}{16}+\dfrac{9}{16}\right)=\dfrac{2021}{2022}.1=\dfrac{2021}{2022}\)
\(a.415\times7-415\times5+415\times8\)
\(=415\times\left(7-5+8\right)=415\times10=4150\)
\(b.23\times87+12\times23+23\)
\(=23\times\left(87+12+1\right)=23\times100=2300\)
a. 415 x 7 - 415 x 5 + 4 15 x 8
= 415 x ( 7 - 5 + 8 )
= 415 x 10
= 41 50
b. 23 x 87 + 1 2 x 23 + 2 3
= 23x 87 + 12 x 23 + 23 x 1
= 23 x ( 87 + 12 + 1 )
= 23 x 100
= 2300
=
403 494 – 16 415) : 7 = 387 079 : 7 = 55 297
= 403 494 : 7 – 16 414 : 7
= 57 642 - 2345 = 55 297