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98 x 101 - 98 7200 : 25 : 4 3200 : (100 : 4)
= (98 - 98) x 101 = 7200 : (25 x 4) = (3200 x 4) : 100
= 0 x 101 = 7200 : 100 = 12800 : 100
= 0 = 72 = 128
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\(1-2+3-4+5-6+.......+97-98+99-100+101\)
\(=\left(1-2\right)+\left(3-4\right)+\left(4-5\right)+.....+\left(97-98\right)+\left(99-100\right)+101\)
\(=50.\left(-1\right)+101=51\)
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a. … = 76 266 – 34 578 = 41 688
… = 126 x 37 = 4662
b. ... = 46 857 + 123 = 46 980
…= 601 759 – 142 = 601 617
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(355 × 98 + 710) - (355 × 101 - 355)
= (355 × 98 + 355 × 2) - 355 × (101 - 1)
= 355 × (98 + 2) - 355 × 100
= 355 × 100 - 355 × 100
= 0
( 355 x 98 + 710 ) - ( 355 x 101 - 335 )
= ( 355 x 98 x 355 x 2 ) - 355 x ( 101 - 1 )
= 355 x ( 98 + 2 ) - 355 x 100
= 355 x 100 - 100
= 355 x 0
= 355
a) 64 x 72 + 28 x 64
= 64 x ( 72 + 28 )
= 64 x 100
= 6400
b) 98 x 101 - 98
= 98 x 101 - 98 x 1
= 98 x ( 101 - 1 )
= 98 x 100
= 9800
a) 64 x 72 + 28 x 64
= 64 x (72 + 28)
= 64 x 100
= 6400
b) 98 x 101 - 98
= 98 x (101 - 1)
= 98 x 100
= 9800