ж) з)
50 ⋅ 4,5 = 225 = 15 ; 1,2 ⋅ 3
1 1 1 = 1 ⋅3 = 5 3 3
6 ⋅ 10 = 4 =2. 5⋅ 3
№373 а) б) в)
2 18
2 = 18
=
23 2300 52
г)
12500
д)
7,5
500 0,3
23 1 1 = = ; 2300 100 10
=
52 = 117
=
117
=
1 1 = ; 9 3
=
4 2 = ; 9 3
12500 = 25 = 3 ; 500
7,5 = 25 = 5 ; 0,3
№374 а) 10 ⋅ 40 = 400 = 20 ; б) 12 ⋅ 3 = 36 = 6 ; в) 162 ⋅ 2 = 324 = 18 ; 2⋅3 = 3⋅8
г)
2 3 ⋅ = 3 8
д)
110 ⋅ 4,4 = 484 = 22 ;
е)
4 1 ⋅ 0,2 = 5
ж)
999 = 111
з)
15 735
=
1 1 = ; 4 2
9 9 3 ⋅ = ; 5 25 5
999 = 9 = 3; 111 15 = 735
1 1 = ; 49 7
№375 Второй способ удобнее; произведем вычисления
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6 ≈ 2,45 .