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5 câu trả lời 283
A, 142 × 12 + 142 × 18 = 142 x (12 + 18) = 142 x 30 = 4260
B, 801 × 67 + 34 × 801 - 801 = 801 x ( 67 + 34 -1) = 801 x 100 = 80100
C, 1/4 × 5/12 + 5/12 × 3/4 = 5/12 x ( 1/4 + 3/4) = 5/12 x 1 = 5/12
D, 17/21 × 9/5 - 17/21 × 4/5 = 17/21 x ( 9/5 - 4/5) = 17/21 x 1 = 17/21
A) 142×12+142×18
= 142×(12+18)
=142× 30 =4260
B) 801×67+34×801-801
=(801×(67+34))-801
=(801×101)-801
=80901-801
=80100
C ) 1/4×5/12+5/12×3/4
=5/12 ×( 1/4+3/4)
=5/12×1=5/12
D) 17/21×9/5-17/21×4/5
=17/21× (9/5-4/5_
=17/21× 1=17/21
A, 142 × 12 + 142 × 18
= 142 x (12 + 18)
= 142 x 30
= 4260
B, 801 × 67 + 34 × 801 - 801
= 801 x (67 + 34)
= 801 x 101
= 80901
C, 1/4 × 5/12 + 5/12 × 3/4
= 5/12 + (1/14 x 3/4)
= 5/12 + 3/56
= 79/168
D, 17/21 × 9/5 - 17/21 × 4/5
= 17/21 x (9/5 - 4/5)
= 17/21 x 1
= 18/21
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