Tính giá trị của biểu thức:
a) 90 – ( 30 – 20) = ..........................
= ..........................
90 – 30 – 20 = ..........................
= ..........................
b) 100 – (60 + 10) = ..........................
= ..........................
100 - 60 + 10 = ..........................
= ..........................
c) 135 – (30 + 5) = ..........................
= ..........................
135 – 30 – 5 = ..........................
= ..........................
d) 70 + (40 – 10) = ..........................
= ..........................
70 + 40 – 10 = ..........................
= ..........................
90-90+30+20
x + 90 = 90 + 30
90 + 90 + 10 + 20 + 30 + 40 + 50 + 60 - 120 = ?
x + 90 = 90 + 30
90+30:2
20+30+90=
câu hỏi là 30+30+30+30+32+56+90+948+951+945+891+789+594+190+900+800+940+709+999+945+494+984=
28x5x20x90x40x30(60+30+90)=?