28×5+2×3×35+21×20+14×40+8×62 55×66+66×77+77×88+88×99
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/09/21 22:28:51
28×5+2×3×35+21×20+14×40+8×62 55×66+66×77+77×88+88×99
脱式计算
脱式计算
28×5+2×4×35+21×20+14×40+8×62
=2×2×7×5+2×4×5×7+3×7×4×5+2×7×5×2×4+8×62
=2×2×7×5×(1+2+3+4)+496
=10×14×10+496
=1400+496
=1896
55×66+66×77+77×88+88×99
=11×5×11×6+11×6×11×7+11×7×11×8+11×8×11×9
=11×11×(5×6+6×7+7×8+8×9)
=121×(30+42+56+72)
=121×200
=24200
=2×2×7×5+2×4×5×7+3×7×4×5+2×7×5×2×4+8×62
=2×2×7×5×(1+2+3+4)+496
=10×14×10+496
=1400+496
=1896
55×66+66×77+77×88+88×99
=11×5×11×6+11×6×11×7+11×7×11×8+11×8×11×9
=11×11×(5×6+6×7+7×8+8×9)
=121×(30+42+56+72)
=121×200
=24200
28×5+2×3×35+21×20+14×40+8×62 55×66+66×77+77×88+88×99
55*66+66*77+77*88+88*99要解释
55×66+66×77+77×88+88×99简便计算
55*66+66*77+77*88+88*99
55+66+77+88+99=?
99*88*77*66*55*44=
55*66+66*77+77*88
99+1+88+2+77+3+66+4+55+5+44+6
1+2+3+4+5+6+7+8+9+10+11+22+33+44+55+66+77+88+99=?
1+2+3+4+5+6+7+8+9+99+88+77+66+55+44+33+22+11
1+2+3+4+5+6+7+8+9+11+22-33+33+44+55+66+77+88+99+12+13+14+15+
1+2+3++5++7+8+9+10+11+22+33+44+55+66+77+88+99+100+200+300+40