9999x1111+3333x667=?
19.98x37-199.8x1.9+1998x0.82=?
3.17-2.74+4.7+5.29-0.26+6.3=?
34.5x8.23+34.5x2.77-34.5=?
0.125x0.25x0.5x64=?
75x4.7+15.9x25=?
172.4x6.2+2724x0.38=?
13.5x9.9+6.5x10.1=?
11.8x43-860x0.09=?
9999x1111+3333x667=?
19.98x37-199.8x1.9+1998x0.82=?
3.17-2.74+4.7+5.29-0.26+6.3=?
34.5x8.23+34.5x2.77-34.5=?
0.125x0.25x0.5x64=?
75x4.7+15.9x25=?
172.4x6.2+2724x0.38=?
13.5x9.9+6.5x10.1=?
11.8x43-860x0.09=?
简便计算这一块其实多数都用到乘法分配律和结合律,还有乘法的性质,一定要熟练掌握,灵活运用,还要注意关观察式子中各数量之间的关系哦
第一个要么多个1要么少个6
9999x1111+3333x6667
=3333x3x1111+3333x6667
=3333x3333+3333x6667
=3333x(3333+6667)
=3333x10000
=33330000
19.98x37-199.8x1.9+1998x0.82
=19.98x37-19398x19+19.98x82
=19.98x(37-19+82)
=19.98x100
=1998
3.17-2.74+4.7+5.29-0.26+6.3
=(3.17+5.29)+(4.7+6.3)-(2.74+0.26)
=8.46+11-3
=16.46
34.5x8.23+34.5x2.77-34.5
=34.5x(8.23+2.77-1)
=34.5x10
=345
0.125x0.25x0.5x64
=0.125x0.25x0.5x8x4x2
=(0.125x8)x(0.25x4)x(0.5x2)
=1x1x1
=1
75x4.7+15.9x25
=25x3x4.7+15.9x25
=25x14.1+15.9x25
=25x(14.1+15.9)
=25x30
=750
172.4x6.2+2724x0.38
=1724x0.62+(1724+1000)x0.38
=1724x0.62+1724x0.38+1000x0.38
=1724x(0.62+0.38)+380
=1724x1+380
=2104
13.5x9.9+6.5x10.1
=13.5x(10-0.1)+6.5x(10+0.1)
=135-1.35+65+0.65
=200-0.7
=199.3
11.8x43-860x0.09
=11.8x43-43x20x0.09
=11.8x43-43x1.8
=43x(11.8-1.8)
=43x10
=430
9999x=3333*(3*
9999x