99+22=?
356-95=?
Những câu hỏi liên quan
3+99+22+33+77+22*69*25-38-95
: Tính nhanh a. 30-29 + 28 -27+26-25+24-23+22-21+20-19= b. 100- 99+98-97+96-95+…..+ 50=
Điền dấu <, >, = thích hợp vào chỗ chấm:
34 ... 50 47 ... 45 55 ... 66
78...69 81...82 44...33
72...81 95...90 77...99
62...62 61...63 88...22
34 < 50 47 > 45 55 < 66
78 > 69 81< 82 44 > 33
72 < 81 95 > 90 77 < 99
62 = 62 61 < 63 88 > 22
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Tính:
a) -70 + 70
b) -99 + 98 + (-97) + 96 + (-95) + 94 + 94 + ... + (-91) + 90
c) (-11) + (-22) + (-33)
d) -840 + 560 + (-160)
a) \(-70+70\)
\(=-\left(70-70\right)\)
\(=-0\)
\(=0\)
c) \(\left(-11\right)+\left(-22\right)+\left(-33\right)\)
\(=-11-22-33\)
\(=-\left(11+22\right)-33\)
\(=-33-33\)
\(=-\left(33+33\right)\)
\(=-66\)
d) \(-840+560+\left(-160\right)\)
\(=-840+560-160\)
\(=-\left(840-560\right)-160\)
\(=-280-160\)
\(=-\left(280+160\right)\)
\(=-440\)
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\(-99+98+\left(-97\right)+96+\left(-95\right)+94+\left(-93\right)+92+\left(-91\right)+90\)
\(=-99+98-97+96-95+94-93+92-91+90\)
\(=-\left(99-98\right)-\left(97-96\right)-\left(95-94\right)-\left(93-92\right)-\left(91-90\right)\)
\(=-1-1-1-1-1\)
\(=-\left(1+1\right)-1-1-1\)
\(=-2-1-1-1\)
\(=-\left(2+1\right)-1-1\)
\(=-3-1-1\)
\(=-\left(3+1\right)-1\)
\(=-4-1\)
\(=-\left(4+1\right)\)
\(=-5\)
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−99+98+(−97)+96+(−95)+94+(−93)+92+(−91)+90−99+98+(−97)+96+(−95)+94+(−93)+92+(−91)+90
=−99+98−97+96−95+94−93+92−91+90=−99+98−97+96−95+94−93+92−91+90
=−(99−98)−(97−96)−(95−94)−(93−92)−(91−90)=−(99−98)−(97−96)−(95−94)−(93−92)−(91−90)
=−1−1−1−1−1=−1−1−1−1−1
=−(1+1)−1−1−1=−(1+1)−1−1−1
=−2−1−1−1=−2−1−1−1
=−(2+1)−1−1=−(2+1)−1−1
=−3−1−1=−3−1−1
=−(3+1)−1=−(3+1)−1
=−4−1=−4−1
=−(4+1)=−(4+1)
=−5
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CHO MK HỎI CÂU NÀY NHÉ!
RÚT GỌN RÒI QUY ĐỒNG??
A)621/486-531/81
B)95/165-35
C)99/121-22/66
4+3/5+3/7+...+3/95+3/97+3/99
1/99+1/3*97+1/5*95+..+1/95*5+1/97*3+1/99*1
tính A= (1+1/3+1/5+...+1/95+1/97+1/99) /(1/1*99+1/3*97+1/5*95+...+1/95*5+1/97*3+1/99*1)
99 x 95 + 99 x 3 + 99 + 99
99 x 95 + 99 x 3 + 99 + 99
= 99 x ( 95 +3 ) + ( 99 + 99 )
= 99 x 98 + 198
= 9702 + 198
= 9900
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99 x 95 + 99 x 3 + 99 + 99= 9405 + 297 + 198
=9900
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a) 99 x 95 + 99 x 3 + 99 + 99
= 99 x 95 + 99 x 3 + 99 x 1 + 99 x 1
= 99 x ( 95 + 3 + 1 + 1 )
= 99 x 100
= 9900
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(x-1/99+x-99)+(x-3/97+x-7/93)+(x-5/95+x-95/5)=6