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Tính nhanh:
a) 425 x 3475 + 425 x 6525
b) 3876 x 375 + 375 x 6124
c) 257 x 432 + 257 x 354 + 257 x 124
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a) 425 x 3475 + 425 x 6525 = 425 x ( 3475 + 6525 ) = 425 x 10000 = 4250000
b) 3876 x 375 + 375 x 6124 = 375 x ( 3876 + 6124 ) = 375 x 10000 = 3750000
c) 275 x 432 + 257 x 354 + 257 x 124 = 275 x ( 432 + 354 + 124 ) = 275 x 910 = 250250
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(x - 425) + 35 = 137
x - 425 = 137 - 35 = 102
x = 102 + 425
x = 527
Chúc bạn học tốt!
(x- 425)+ 35 = 137
=> x-425 = 137 - 35 = 102
=> x = 102 + 425 = 527
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425x27+425x72+425
=425x27+425x72+425x1
=425x(27+72+1)
=425x100
=42500
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a) 425 x 3475 + 425 x 6525
= 425 x (3475 + 6525)
= 425 x 10000
= 4250000
b) 175 x 1274 - 175 x 273 - 175
= 175 x 1274 - 175 x 273 - 175 x 1
= 175 x (1274 - 273 - 1)
= 175 x 1000
= 175000
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319 + 425 = 425 + 319
(173 + 454) + 346 = 173 + (454 + 346)
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525 x 2019 - 2019 x 425 = 2019 x (525 - 425) = 2019 x 100 = 201900
425x(65+35)=425x100=42500
425x65+425x35
=425x[65+35]
=425x100
=425000