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Toán Lớp 4: Tính bằng cách thuận tiện a) 13 × 8 × 125 × 5 c) 245 × 123 – 22 × 245 – 245 b) 37 × 2 × 50 × 10 d) 18 × 75 + 37 × 18 – 18 × 12

Home/ Toán Lớp 4: Tính bằng cách thuận tiện a) 13 × 8 × 125 × 5 c) 245 × 123 – 22 × 245 – 245 b) 37 × 2 × 50 × 10 d) 18 × 75 + 37 × 18 – 18 × 12

Toán Lớp 4: Tính bằng cách thuận tiện a) 13 × 8 × 125 × 5 c) 245 × 123 – 22 × 245 – 245 b) 37 × 2 × 50 × 10 d) 18 × 75 + 37 × 18 – 18 × 12

Thái Lâm Tháng Bảy 23, 2022 Toán học 2 Comments 0 views

Toán Lớp 4: Tính bằng cách thuận tiện
a) 13 × 8 × 125 × 5 c) 245 × 123 – 22 × 245 – 245
b) 37 × 2 × 50 × 10 d) 18 × 75 + 37 × 18 – 18 × 12

Comments ( 2 )

buithaianh98
23 Tháng Bảy, 2022 at 4:04 chiều

Reply

a, 13 xx 8 xx 125 xx 5

= (125 xx 8 xx 5) xx 13

= 5000 xx 13

= 65000

b, 37 xx 2 xx 50 xx 10

= (50 xx 10 xx 2) xx 37

= 1000 xx 37

= 37000

c, 245 xx 123 – 22 xx 245 – 245

= 245 xx 123 – 22 xx 245 – 245 xx 1

= 245 xx (123 – 22 – 1)

= 245 xx 100

= 24500

d, 18 xx 75 + 37 xx 18 – 18

= 18 xx 75 + 37 xx 18 – 18 xx 1

= 18 xx (75 + 37 – 1)

= 18 xx 101

= 1818
dantam45
23 Tháng Bảy, 2022 at 4:03 chiều

Reply

a) 13 × 8 × 125 × 5

=(13 × 5 ) × (8 × 125 )

= 65 × 1000

= 65000

b) 37 × 2 × 50 × 10

= (37 × 10 ) × ( 50 × 2 )

= 370 × 100

= 370 000

c) 245 × 123 – 22 × 245 – 245

= 245 × ( 123 – 22 – 1 )

= 245 × 100

= 245 000

d) 18 × 75 + 37 × 18 – 18 × 12

= 18 × ( 75 + 37 – 12 )

= 18 × 100

= 1800

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