Giải SGK Toán 7 sách Kết nối tri thức: Luyện tập chung trang 24

Thứ sáu - 23/09/2022 03:58
Giải SGK Toán 7 sách Kết nối tri thức: Luyện tập chung trang 24, ...
Bài 1.31 - Trang 24: Tìm x, biết:
bai 4 cau 31
Giải:
bai 4 cau 31 a
bai 4 cau 31 b

Bài 1.32 - Trang 24: Diện tích của một số hồ nước ngọt lớn nhất trên thế giới được cho trong bảng sau. Em hãy sắp xếp chúng theo thứ tự diện tích từ nhỏ đến lớn.
bai 4 cau 32
Giải:
Đổi 8,264.109 = 0,8264.10.109 = 0,8264.1010; 3,71.1011 = 3,71.10.1010= 37,1.1010
Do 0,8264 < 1,56 < 1,896 < 2,57 < 3,17 < 5,8 < 6,887 < 8,21 < 37,1
nên
0,8264.1010< 1,56.1010 < 1,896.1010 < 2,57.1010 < 3,17.1010 < 5,8.1010 < 6,887.1010
< 8,21 .1010 < 37,1.1010
Hay 8,264.109 < 1,56.1010 < 1,896.1010 < 2,57.1010 < 3,17.1010 < 5,8.1010 < 6,887.1010
< 8,21.1010 < 3,71.1011.
Vậy tên các hồ nước ngọt theo thứ tự diện tích từ nhỏ đến lớn là: Nicaragua, Vostok, Ontario, Erie, Baikal, Michigan, Victoria, Superior, Caspian.

Bài 1.33 - Ttrang 24: Tính một cách hợp lí.
a) A = 32,125 – (6,325 + 12,125) – (37 + 13,675)
b) B = 4,75 + + 0,52 – 3 .
c) C = 2021,2345 . 2020,1234 + 2021,2345. (-2020,1234)
Giải:
Thực hiện phép tính như sau:
a) A = 32,125 – (6,325 + 12,125) – (37 + 13,675)
A = 32,125 – 18,45 – 37 – 13,675
A = (32,125 – 13,675) – 18,45 – 37 ----> Tính chất kết hợp
A = 18,45 – 18,45 – 37
A = -37
bai 4 cau 33

c) C = 2021,2345 . 2020,1234 + 2021,2345. (-2020,1234)
C = 2021,2345 . 2020,1234 - 2021,2345. 2020,1234
C = 0

Bài 1.34 - Trang 24: Đặt một cặp dấu ngoặc “()” vào biểu thức sau để được kết quả bằng 0.
2,2 – 3,3 + 4,4 – 5,5
Giải:
Thực hiện phép tính như sau:
2,2 – (3,3 + 4,4 – 5,5)
= 2,2 – 2,2 = 0

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