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\(\left(218.99+218\right)-\left(215.101-215\right)\)
\(=\left[218\left(99+1\right)\right]-\left[215\left(101-1\right)\right]\)
\(=218.100-215.100\)
\(=\left(218-215\right).100\)
\(=3.100\)
\(=300\)
học tốt
5 x 217 x 20 - 4 x 215 x 25
= 1085 x 20 - 4 x 215 x 25
= 21700 - 4 x 215 x 25
= 21700 - 860 x 25
= 21700 - 21500
= 200
\(5.217.20-4.215.25\)
\(=\left(5.20\right).217-\left(4.25\right).215\)
\(=100.217-100.215\)
\(=100.\left(217-215\right)\)
\(=100.2=200\)
Nhớ k cho mình nhé! thank you!!!
= 215 x 85 + 215 x 1 + 215 x 14
= 215 x ( 85 + 14 +1 )
= 215 x 100
= 21500
Đáp án:
215 x 85 + 215 + 215 x 14
=215 x (85 + 14 +1)
=215 x 100
=21500
\(\text{ (215 x 4 - 76 x 5): 4}\) \(=\left(860-380\right):4=480:4=120.\)
`@` `\text {Ans}`
`\downarrow`
`A)`
`37 \times 46+37 \times 51+111`
`= 37 \times (46+51)+111`
`= 37 \times 97+111`
`= 3589 +111`
`= 3700`
`B)`
`35 \times 215-35 \times 210-175`
`= 35 \times (215-210)-175`
`= 35 \times 5-175`
`= 175-175=0`
`E)`
`76 \times 102-76 \times 2`
`= 76 \times (102-2)`
`= 76 \times 100`
`= 7600`
`C)`
`85 \times 94+85 \times 2 +170 \times 2`
`= 85 \times (94+2) + 170 \times 2`
`= 85 \times 96+170 \times 2`
`= 8160+340`
`= 8500`
`48 \times 56+28 \times 104`
`= 48 \times 28 \times 2+28 \times 104`
`= 28 \times (48 \times 2+104)`
`= 28 \times (96+104)`
`= 28 \times 200`
`= 5600`
`G)`
`206 \times 12-206-206`
`= 206 \times (12-1-1)`
`= 206 \times 10`
`= 2060`
a) 37 x 46 + 37 x 51 + 111
= 37 x ( 46 + 51 ) + 111
= 37 x 97 + 111
= 3589 + 111
= 3700
b) 35 x 215 - 35 x 210 - 175
= 35 x ( 215 - 210 ) - 175
= 35 x 5 - 175
= 175 - 175
= 0
e) 76 x 102 - 76 x 2
= 76 x ( 102 - 2 )
= 76 x 100
= 7600
c) 85 x 94 + 95 x 2 + 170 x 2
= 7990 + 2 x ( 95 + 170 )
= 7990 + 2 x 265
= 7990 + 530
= 8520
48 x 56 + 28 x 104
= 2688 + 2912
= 5600
g) 206 x 12 - 206 - 206
= 2472 - 206 - 206
= 2266 - 206
= 2060
5 x 217 x 20 - 4 x 215 x 25
= ( 5 x 20 ) x 217 - ( 4 x 25 ) x 215
= 100 x 217 - 100 x 215
= 100 x ( 217 - 215 )
= 100 x 2
= 200
5 x 217 x 20-4 x 215 x 25
=(5 x 20) x 217-(4 x 25) x 215
=100 x 217-100 x 215
=100 x (217-215)
=100 x 2
=200
a)
Ta có 215 x 86 +13 x 215 +215
=215x(86+13+1)
=215 x 100
=215
b)
Ta có 52 x 128 - 41 x 128 - 128 -128
=128 x ( 52 -41 -1-1)
=128 x 9
=1152
\(215\times94+215\times5+215\)
\(=215\times\left(94+5+1\right)\)
\(=215\times100\)
\(=21500\)
215 × 94 + 215 × 5 + 215
= 215 × ( 94 + 5 + 1 )
= 215 × 100
= 21500