A.2+4=14 | B.2-4=14 | C.14+2=4 |
A.x+18=88 | B.x-18=88 | C.x+x+18=88 | D.x-18+x=88 |
A.4=70+2 | B.70-4=2 | C.4-2=70 |
A.13.5 | B.23.5 | C.28.5 | D.64 |
A.2x+12=128 | B.2x-12=128 | C.128-2x=12 |
A.22 |
B.30 |
C.11 |
A.x-99=1260 | B.x+99=1260 | C.x-1260=99 |
A.直接用算术法,列式是:30÷3 |
B.要求的乙数是一倍数,如果用算术法,思维逆向;如果用方程,思维很顺向 |
C.用方程比较简单,设乙数是x,则甲数是3x,列方程是:x+3x=30 |
A.200÷(30+20) |
B.200÷(30×2+20) |
C.200÷(30×2-20) |
A. | B. | C. | D. |